The phrase FBI open up became a widespread internet meme used to mock sudden police raids in short videos, edits, and reaction clips, where the shout alone signals that a private or embarrassing moment is about to be exposed. It spread through social video platforms as creators reused the line for pranks, gaming moments, and parody raids, often pairing it with a door knock or a louder explosion version for extra impact. Its staying power comes from instant recognition: listeners understand the joke in under three seconds, without needing any setup or context.