The sound comes from Team Fortress 2, Valve's class-based shooter first released in 2007, where the Sniper can line up a penetrating shot with the Machina rifle. Clips of rare double kills from a single charged bullet were shared widely in montage culture on YouTube, turning the railgun blast and kill confirmation into shorthand for perfect aim. It remains popular because genuine lined-up shots are uncommon, so creators reuse the audio to exaggerate ordinary FPS plays, celebrate real highlights, and signal a clean double elimination instantly to viewers who know the game well today.