Masterbation; Whacking off; touching one's self
"I walked in on Keefer Killinit yesterday."
Ben was killin' his dick yesterday.
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"
To have sex in a hardcore manner.
I walked in on Johny killin it with Kortnee.
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
Someone who is doing very well in every facet of life
Why is the wolf killin it so much
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!
A way of saying someone is really good at dancing or other active motions
Ay yo brah u is killin' it from party rock anthem.