British English slang. It means to mug someone.
The boys needed beer money, so they koshed an Irishman on his way to the bar.
by R. Kemp January 14, 2005
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I just koshed a beer.
Are you going to kosh one as well?
*koshhh*
by xre June 9, 2010
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"This Weed Is Kosh."
by 23 April 7, 2005
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Kosh refers to someone who offers to befriend you but instead Sexually Assaults you.
"I swear her bag was in the Innit I didn't mean to be a kosh"
by TheManInBlackInWhite October 16, 2019
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short for kosher.

1. as in kosher (jewish) foods. need to be prepared specialy. strict and picky in general. so it means someone who is really picky about foods and asks lots of questions to the waiters and such

2. high class, picky.
1. "my date wanted to know everything that was in the pasta sauce. then he asked to have 2 icecubes in his water. it was so embarassing. i was like 'stop being so godamn kosh'"

2. "so i walked in there all kosh and asked to see all the pink phones they had"
by mayinsummer March 14, 2007
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