Top Definition
To play it cool or smooth in a tight situation. Origin: Kosher, Kosh is short for kosher.
Dude #1: Dude, isn't that Kristen coming this way?
Dude #2: Yeah dude, she's smoking hot. What I wouldn't do to get with her.
Dude #1: Dude. Just keep it kosh man or you'll blow your chances with her.
by DurbanSun November 01, 2009

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