The sound comes from Valve's Counter-Strike series, where Terrorists plant a C4 explosive at a bombsite and Counter-Terrorists must defuse it before it detonates, faster with a defuse kit. That defuse interaction has been a core objective since the early versions of the game and remains central in CS2. Clips of successful defuses became a staple of gameplay videos and montages, and the isolated audio spread to soundboards and meme edits as shorthand for stopping a disaster at the very last moment.