This sound comes from the flashbang effect in Counter-Strike: Global Offensive, Valve's competitive shooter released in 2012. The ringing aftermath became a familiar audio cue for players because flashbangs are a core part of Counter-Strike gameplay. Outside the game, the effect spread through frag movies, Twitch clips, YouTube montages and short meme edits. It is still used because the sound quickly communicates disorientation, sensory overload and the feeling of being caught off guard, even to viewers who only casually know the game.