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To do something with the best of your ability; to become a legend in the process or to achieve 1337 status whilst performing the said phrase.
B: Hey YO JOE!! What did you wind up doing last night ?

Joe: YO SON, I WAS KILLIN IT!

B: OHHH SHNAP! THATS WHATS UP MY NINJA!
by FPSTOM January 19, 2010
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did it very well, you were the best at it,did something extremly good
when I dance I be killin It, I was killin it when I was singin that song
you killed it homie
by Nikki Banks April 25, 2009
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1.to be doing something very good

"john was killin it all day long in the competition"

2. to do your own thing, in a sorta funny way
1. "john was killin it all day long in the competition"

2. "max is killin it in his overalls"
by alex July 16, 2004
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