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Exclusively used in the negative, meaning something that is not right, lawful or good. Relating to the Jewish word used for the correct preparation of foods.
Bob: Woah.. There's a guy in the bushes over there.
John: He's pointing that camera at that school over the road.
Bob: Dude, that is not kosha.
by Akabocha April 08, 2011
Excellent, could not be any better.
What a kosha night.
by Anonymous March 13, 2003