One who interrupts a fight and delivers the final blow on a target that someone else has been wearing down, taking all the credit. Primarily used in multiplayer videogames, especially the Super Smash Bros. series from which it was born.
"Hey, he was mine, you killstealer!"
by Zaenos August 3, 2006
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Noun, when you're about to kill an enemy in an online game, and another player comes out of nowhere and kills them instead, in one or two shots, usually a n00b.
Shit dude, I was about to kill Matt-O when this douche jumped up nd got a headshot!! Killsteal.
by Matt-0 June 18, 2009
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guy who plays halo and hangs around watching there teammates mostly die, and then swoops in for the kill.
oh my god, collin is such a killsteal.
by gumpwumper February 5, 2009
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