Oh god no is a common spoken reaction rather than a line tied to one famous film or show, which is why the same short exclamation appears in many different memes, edits and reaction videos online. Its strength is its familiarity: almost everyone recognises the feeling behind it, whether the trigger is a fail, a plot twist or an awkward message. Because the phrase works without context, creators reuse it for gaming clips, storytimes and short-form comedy, and its short length makes it easy to drop into a punchline without slowing the edit down.