The exclamation comes from Brazilian meme culture, where fudeu is slang for being completely screwed, paired here with the Metal Gear stealth series created by Hideo Kojima for Konami and first released in 1987. The joke relies on the contrast between serious tactical espionage and a panicked shout when cover is blown. It spread through gaming videos, streams and soundboards in Portuguese speaking communities, then wider as a reaction clip for an enemy spotted moment that instantly ruins a plan.