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1.
Someone in a multiplayer video game who waits for someone to weaken their enemy and kills them last second so instead of the person who did all the work getting credit the the person who stole gets it.
Person 1: WOW, that's so gay!
Person B: What happened?
Person 1: This noob just stole my kill!
Person B: I fuckin hate Kill Stealers!
Urmomther tarafından 23 Aralık 2007, Pazar
 
2.
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!"
Zaenos tarafından 2 Ağustos 2006, Çarşamba
 
3.
Referring to any person who takes the last shot on an enemy character and only the last shot and getting the kill. can be used for any game. Quite prolific on Halo and COD.
holy shit ive been shooting this guy for ages he must be close to dieing O WHAT THE FUCK HOW DID I NOT GET THAT, YOU FUCKING KILL STEALER.
Dizzylittlelord tarafından 2 Nisan 2010, Cuma