This sound comes from Among Us, the multiplayer social deduction game developed by Innersloth. The game released in 2018 and exploded in popularity in 2020, which helped the imposter kill audio become instantly recognizable far beyond gameplay videos. Online, creators use it as a shorthand for betrayal, suspicion and sudden elimination in memes, short edits and reaction posts. Its lasting appeal comes from how quickly it communicates the idea of getting exposed or taken out, even in clips that have nothing to do with the game.