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1.
to stop something from happening; to restrain

to put the kibosh on something
those idiot GOPs put the kibosh on Kerry becoming President
by Companion of Drear November 22, 2004
 
2.
To suddenly bring an end to a positive performance or hot streak with a single extremely terrible or series of awful performances, plays, or shots.
Yeah but he'll probably say something stupid and kibosh the whole thing.
by mrbojangals May 28, 2010
 
3.
To end a relationship that is not really a relationship
"Max put the kibosh on that"
"I got kiboshed"
by Saashi February 12, 2008
 
4.
a threesome involving 2 men and one woman where both men hump the chick at one point or another during the ordeal.
Mike and Jay kiboshed that fat chick last night!
by SAP March 03, 2005