The teamkiller tag comes from multiplayer shooters, where killing a teammate is tracked as its own shaming event rather than a normal frag. Short Quake-flavored versions circulate on soundboards next to other tactical shooter callouts like bomb plant callouts and enemy spotted alerts, because they share the same clipped announcer energy. Editors favor this one for fail compilations and friendly-fire montages, where a single harsh sting explains the joke faster than commentary. Its staying power is utility: every multiplayer session eventually produces a team kill worth mocking.