To ruin or mess up by doing something annoying. ("killing a high")
Stop f*ckin around man! You're killin' it!
viết bởi Nancy 08 Tháng mười hai, 2004
performing at the highest level; ripping;
That guy surfing the blue board on the south side this morning was killing it...
viết bởi johnny utah 15 Tháng hai, 2005
always looking fresh, somebody who is doing well.
Nick Spanos is killing it

swag fresh
viết bởi nikoff888 12 Tháng mười, 2012
The act of 'killing it' would be performed after a joke is being told when everyone has just got done laughing and 'the killer

tries to be funny and adds on to the joke in attempts of making it funnier. This of course is not funny, and in turn, 'the killer' was just a big buzzkill, otherwise known as 'killing it'
Person 1: Dude, Blake thinks he's so funny but no one ever laughs at him...

Person 2: Seriously, he tries to make everyone laugh, but all he's doing is killing it.
viết bởi OprahhWinfreyyy 05 Tháng sáu, 2010
To put an unnecessary end to a good conversation by making a stupid comment.
Will, you killed it!

Sorry Will, but you can't make any comment without killing it. Even if you try to start the conversation, you kill nothing.
viết bởi Adam Fadida 10 Tháng một, 2008

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