The sound comes from The Battle Bricks, a Roblox tower defense game where players deploy brick units against waves of enemies. Fatboy is remembered as one of the bulky foes whose arrival changes the pace of a stage, so his spawn cue became a shorthand among fans for a heavy enemy appearing. Clips and soundboard copies spread through Roblox edits and short gaming videos, where the cue is now reused outside gameplay to mark any exaggerated, boss-like entrance or sudden appearance of something very large.