1 definition by FPSTOM
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!
Joe: YO SON, I WAS KILLIN IT!
B: OHHH SHNAP! THATS WHATS UP MY NINJA!
by FPSTOM January 20, 2010