There is no widely documented original source for pee pee poo check, and it circulates mainly as a user-made meme sound rather than a clip from a film, show or song. Its appeal comes from simple bathroom humour that translates across languages and needs no context to understand. Online creators reuse it in short edits, reaction clips and gaming moments where a quick, childish joke fits the scene. Because the phrase is short, repeatable and easy to remember, it keeps resurfacing whenever a new potty joke or checklist gag trends.