The exact origin of this clip is unclear, and it circulates mainly as an anonymous meme upload with the stretched spelling GGGOOOKKKUUU. It caught on because the exaggerated, wobbling yell is instantly recognisable as anime-style hype shouting, even without any confirmed show or episode attached. Editors on meme pages and short-form video apps reuse it as a generic power-up gag, pairing it with flexing, glowing-eyes edits and dramatic zooms. Its appeal is the delivery alone: loud, silly and impossible to take seriously.