This sound comes from Among Us, the social deduction game developed by Innersloth. Players hear the role reveal cue at the start of a match when the game assigns Crewmate or Impostor. The effect spread widely during the game's huge online popularity in 2020, especially in short meme edits and suspicious-character jokes. It remains popular because the audio instantly communicates secrecy, distrust and an incoming reveal, even when used outside the game.