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Kaas (in kaas oyf) - Angry (with)
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Kabaret forshtelung - Floorshow
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Kabtzen, kaptsen - Pauper
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Kaddish - A mourner's prayer
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Kaddishel - Baby son; endearing term for a boy or man (Derived from word "kaddish" which is a prayer for the dead that only males recite)
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Kadoches - Fever
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Kadoches mit koshereh fodem! - Absolutely nothing! (Lit., fever with a kosher thread)
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Kaftan - Long coat worn by religious Jews
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Kain ein horeh - No evil eye! Great piece of good fortune.
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Kakapitshi - Conglomeration
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Kalamutneh - Dreary, gloomy, troubled
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Kalleh moid - A girl of marriageable age
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Kallehniu - Little bride
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Kalyekeh - Cripple; misfit; also, anybody not good at their craft or sport
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Kalyeh - Bad, wrong, spoiled , annoying
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Kam derlebt - Narrowly achieved (Lit., hardly lived to see)
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Kam mit tsores! - Barely made it! (Lit., with some troubles) The word "Kam," also is pronounced "Kom" or "Koim" depending on the region people come from.
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Kam vos er kricht - Barely able to creep; Mr. Slowpoke
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Kam vos er lebt - He's hardly (barely) alive.
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Kamtsoness - To be miserly
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Kaneh - An enema
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Kaporeh, (kapores) - Atonement sacrifice; forgiveness; (slang) good for nothing
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Karabelnick - Country peddler
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Karger - Miser, tightwad
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Kasheh - Groats, mush cereal, buckwheat, porridge; a mess, mix-up, confusion
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Kasheh varnishkes - Cooked groats and broad (or bowtie) noodles
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Kashress - Kosher condition; Jewish religious dietary law
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Kasnik, (keisenik) - Angry person; excitable person, hot head
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Kasokeh - Cross-eyed
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Katshkedik (Americanism) - Ducky, swell, pleasant
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Katzisher kop - Forgetful (Lit., Cat head)
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Kazatskeh - Lively Russian dance
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Kemfer - Fighter (usually for a cause)
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Ken zein - Maybe, could be
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(To) Kibbitz - To offer unsolicited advice as a spectator
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Kibbitzer - Meddlesome spectator
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Kiddish (Borai pri hagofen) - Blessing over wine on the eve of Sabbath or Festivals
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Kimpet-tzettel - Childbirth amulet or charm (from the German "kind-bet-tzettel" meaning childbirth label containing Psalm 121, names of angels, patriarchs
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Kimpetoren - Woman in labour or immediately after the delivery
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Kind un kait - Young and old
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Kinderlech - Diminutive, affectionate term for children
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Kishef macher - Magic-worker
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Kishkeh - Stuffed derma (Sausage shaped, stuffed with a mixture of flour, onions, salt, pepper and fat to keep it together, it is boiled, roasted and sliced)
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(A) Kitsel - Tickle
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Klainer gornisht - Little prig (Lit., A little nothing)
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Klemt beim hartz - Clutches at my heartstrings
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Klaperkeh - Talkative woman
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Klipeh - Gabby woman, shrew, a female demon
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Klogmuter - Complainer, chronic complainer
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(A) Klog iz mir! - Woe is me!
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Klop - Bang, a real hard punch or wallop
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Klotz (klutz) - Ungraceful, awkward, clumsy person; bungler
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Klotz kasheh - Foolish question; fruitless question
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Kloymersht - Not in reality, pretended (Lit., as if it were)
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K'nacker - A big shot
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K'naidel (pl., k'naidlech) - Dumplings usually made of matzoh meal, cooked in soup
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K'nippel - Button, knot; hymen, virginity; money tied in a knot in a handkerchief
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K'nish (taboo) - Vagina
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K'nishes - Baked dumplings filled with potato, meat, liver or barley
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Kochalain - Summer boarding house with cooking privileges (Lit., cook by yourself)
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Kochedik - Petulant, excitable
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Kochleffel - One who stirs up trouble; gadabout, busy-body (Lit., a cooking ladle)
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Kolboynik - Rascally know-it-all
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(A) Kop oif di plaitses! - Good, common sense! (Lit., A head on the shoulders!)
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Kopvaitik - Headache
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Kosher - Jewish dietary laws based on "cleanliness." Also referring to the legitimacy of a situation. "This plan doesn't seem kosher."
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Koved - Respect, honour, reverence, esteem
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Krank - Sick
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Krank-heit - Sickness
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Krassavitseh - Beauty, a doll, beautiful woman
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Krechts - Groan, moan, complain
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Krechtser - Blues singer, a moaner
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Kreplach - Small pockets of dough filled with chopped meat which look like ravioli, or won ton, and are eaten in soup; (slang) nothing, valueless
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Kroivim - Relatives
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Kuck im on (taboo) - Defecate on him! The hell with him!
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Kuck zich oys! (taboo) - Go take a shit for yourself! ..Or explain yourself, get to the point.
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Kugel - Pudding
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Kuk im on! - Look at him!
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Kumen tsu gast - To visit
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Kuntzen - Tricks
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Kunyehlemel - Naive, clumsy, awkward person; nincompoop; Casper Milquetoast
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Kurveh - Whore, prostitute
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Kush in toches arein! (taboo) - Kiss my behind! (said to somebody who is annoying you)
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Kushinyerkeh - Cheapskate; woman who comes to a store and asks for a five cents' worth of vinegar in her own bottle
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K'vatsh - Boneless person, one lacking character; a whiner, weakling
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K'velen - Glow with pride and happiness, beam; be delighted
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K'vetsh - Whine, complain; whiner, a complainer
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K'vitsh - Shriek, scream, screech