The phrase FBI open up became a widespread internet meme as creators used it to stage sudden, exaggerated raids in short videos, often cutting from an ordinary or shady scene to officers bursting in. It spread through TikTok, YouTube and meme pages, where the same shouted line was reused over countless edits, pranks and gaming clips. Its staying power comes from its simplicity: anyone instantly understands the joke without context, and the abrupt interruption works in almost any scenario, from caught-in-the-act moments to over-the-top roleplay.