The story
Back-formation from kill stealer.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: In a multiplayer online game, to deal a finishing blow on an enemy that other player(s) had almost killed, without their consent, so that one gets the credit or rewards instead of them. Full definition →
Back-formation from kill stealer.
Etymology from Wiktionary, CC BY-SA 4.0.