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1.
The act of owning a situation; completion of race; finishing a rigorous workout; getting a promotion; being awesome.

A viral hashtag of people being epic. #killdit
Guy 1: How about that game last night?
Guy 2: Yeah, they killdit.

Guy 1: Did you just see that girl walk by? (hot girl)
Guy 2: Yeah, she killdit.

Finishing a yummy steak. (Picture of 20oz. Steak) #killdit
by mr_niceguy April 03, 2013