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intransitive verb
sometimes used interjectionally with an object (as a personal or reflexive pronoun) to express success after having a good night.
Typically used by a comedian : to celebrate the one (1) good night on stage out of 100 (one hundred) without unfairly or harsh criticism by audience.
1. Jay Ward had the room rocking & "Killed It" on stage tonight.
2. The only place Woody Batilaran "Kills It" is alone with his hand at the end of the night.
3. I once saw Jamie Ward "Kill It" at the Improv but I was really high that night.
by rocked the house, sucessful, February 16, 2014
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3
Finishing something in an epic way.

Often used to refer to a band making a great performance.
Canadian metalhead 1: Did Three Days Grace kill it last night?
Canadian metalhead 2: They really did! So did Billy Talent and Nickelback!
by chemicalpark January 23, 2016
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5
to say something that ends a joke making it not funny.

or saying something that makes everybody feel awkward with fake uneasy laughs.
i have never taken it up the butt.
well...i suppose i have because one time when i was wiping my ass my finger broke through the toilet paper.
...dont ever kill it again
by buttfun December 24, 2005
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7
To finish off a bottle of beer or other alcahol
"Hey man, I can't finsih this bottle of beer...kill it.
by hghghg November 21, 2003
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