The line comes from Warhammer 40,000: Dawn of War, Relic Entertainment's 2004 real-time strategy game set in Games Workshop's grimdark universe. Its squad morale system made units break and flee under heavy fire, and the Imperial Guard's panicked barks became fan favourites because Guardsmen are famously fragile mortals facing impossible horrors. Clips of the voice lines circulated on YouTube compilations and Warhammer meme pages, then landed on soundboards where creators reuse them for any cowardly retreat. It endures because the Guard's terror is the most human sound in a universe of super-soldiers.