Team Fortress 2 is Valve's class-based multiplayer shooter first released in 2007, and the Heavy is its slow, minigun-wielding frontline class known for short, expressive voice responses during matches. Like many of his grunts, laughs and battle cries, this brief oooh was pulled from the game files and shared as a standalone reaction clip. It spread through gaming edits and soundboards alongside other extracted TF2 voice lines, where its brevity and the Heavy's distinctive deep voice made it easy to reuse for surprise, curiosity or mock amazement in almost any clip.