Killsteal 

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.

Killsteal by Matt-0 June 17, 2009

killsteal 

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.

killsteal by gumpwumper February 4, 2009

Killstreak 

A reward given to players in Newer Call Of Duty games after killing a certain amount of enemies without dying. Normally consisting of a support helicopter, dogs, or air-strike. Until Modern Warfare 2 was released and gave players many more rewards for camping and being little pansies abusing care packages and sentry guns. Higher streaks include Harriers that hover with chain guns, predator missiles you control and AC-130 and chain gunships that spawn kill.

Upon camping your ass off to a 25 killstreak you can call in a nuclear warhead to end the game, because by that time the entire server is sick of your shit and at least Infinity Ward is self aware of what they did to a "realistic" war shooter.

Smokeytoke420 with a title and emblem of a weed leaf obtained his AC-130 Killstreak where he proceeded to spawn kill the enemy team as they were punished for not camping.

Killstreak by Moonjabi January 6, 2010

kill-steal

Attacking a mob in a MMORPGthat has already been engaged in combat. Usually for the purpose of obtaining looting rights over another individual or group.

Often a tactic used by a griefer to annoy other players.

You tried to kill-steal Peter Lee again, but failed miserably.

That guild of griefers keeps trying to kill-steal when we spawn mercs.

kill-steal by camb November 18, 2003

xxx on a killstreak 

Late rapper xxxtentacion had a song named, ''RIP ROACH''. One of the lyrics from the song says, "xxx on a killstreak''.

Yo, had you heard this song called RIP ROACH? It's fire vro, "xxx on a killstreak''.
Bro that sounds neat im finna listen to it ong.

xxx on a killstreak by TRPLE4 January 23, 2021

killstealer 

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!"

killstealer by Zaenos August 10, 2006

Killstreaker 

A girl who purposely aims low and flirts with males in a lower league (especially with simps or white knights) in hopes of adding to their body count to impress a male who is in a higher league.

Lydia is such a Killstreaker. She is only hanging out with James to impress Johnathan.

Killstreaker by simpdeystroyer December 21, 2019