This is a generic reaction exclamation rather than a line tied to one film, show or creator, which is part of why it travels so easily online. The phrase has long been used in everyday speech to express shock, disbelief and excitement, and short voice clips of it became a staple of reaction videos, meme edits and livestream highlights. Because listeners understand the emotion instantly, without context, creators keep reaching for it whenever a moment needs an exaggerated, relatable response.