The line comes from Michael Scott in the American sitcom The Office, where his horrified reaction to unwelcome news became a widely shared reaction clip. Editors clipped the shout, stripped it of context and spread it across social media and soundboards, where it now works as shorthand for dread or disbelief. It sits alongside other scream meme clips and oh my god meme reactions, and its staying power comes from how instantly the panic reads, even without knowing the original scene.