The phrase itself is simple Spanish: di means say and patata means potato, so the line works like a playful version of say cheese, with Pepe as the person being addressed. Shared as a short meme sound, it has circulated mainly in Spanish-language joke edits, reaction videos and chat messages, where its odd, everyday wording is the joke. Its appeal is not a famous scene or catchphrase from a show, but the way such a plain instruction can sound funny out of context. That everyday absurdity is why creators keep reusing it as a quick, lighthearted reaction.