The phrase comes from the Latin American Spanish dub of The Simpsons, where despacio, cerebrito became a quotable way to tell someone, or your own brain, to slow down. Short clips of the line spread through Spanish speaking meme pages, messaging apps and short video edits, often paired with confused characters and dubbed Simpsons reactions. It stayed popular because the joke needs no context: even listeners who never saw the episode understand the teasing tone, and the line works for any explanation that suddenly gets too clever, too fast, or too technical.