This sound comes from Team Fortress 2, Valve's class-based multiplayer shooter released in 2007. Players know it as the audio cue tied to a revenge kill, which gives the moment an extra sense of closure. Because TF2 has stayed popular through clips, frag videos and meme edits for years, the revenge stinger remains easy to recognize online. It is still used when creators want a compact gaming cue for payback, much like other classic multiplayer notifications such as Enemy Spotted or bomb has been planted.