The grunt comes from Amnesia: The Dark Descent, the 2010 survival horror game by Frictional Games, where the Grunt is one of the shambling monsters that hunts the player through dark castle corridors. Players first heard these guttural noises while hiding from enemies they could barely see, which made the sound closely tied to dread and pursuit. It later spread through gameplay clips, horror compilations and soundboards, where creators reused it as a quick shorthand for something monstrous approaching, keeping it popular long after the game itself.