The line is spoken by Penny, played by Kaley Cuoco in The Big Bang Theory, the CBS sitcom that premiered in 2007. Penny often used folksy, made up exclamations instead of swearing, and this one stuck with fans because it sounded both shocked and silly. Clips of the moment circulated on forums, YouTube edits and soundboards, turning it into a reusable reaction for disbelief. It remains popular because the wording is clean, quotable and instantly recognisable even without the scene.