The line comes from Team Fortress 2, Valve's 2007 class-based shooter, voiced for the Heavy Weapons Guy. It was popularised by the official Meet the Heavy short from 2007, where the Heavy mocks his enemies, and the phrase became one of his most quoted taunts. Clipped from in-game voice responses, it spread through YouTube edits, Garry's Mod videos and gaming soundboards as a universal way to dismiss whining and celebrate a one-sided win.