The exact origin of this chant is unclear, which is fitting for a clip built on pure nonsense. Versions of the 'pee pee la poo poo' sing-song have floated around meme pages and soundboards for years, passed along because the phrase is impossible to say without laughing. It belongs to the same family as goofy ahh sounds, thriving on short-form video where a five-second burst of silliness can carry a whole joke. Creators keep reaching for it because it needs no context: the absurdity is the entire punchline.