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1.
Excellent, could not be any better.
What a kosha night.
by Anonymous March 13, 2003
 
2.
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