The exact original recording behind this clip is not widely documented, so it circulates mainly as a user-shared reaction sound on soundboards and in short-form video, rather than as a clearly credited line from a film or show. That ambiguity has not slowed it down, because the phrase itself is instantly readable as slang for stunned disbelief. Editors reuse it for the same reason they reuse other short vocal reactions: it needs no setup, it fits a five-second beat, and it gives a fail, reveal or twist a human voice instead of a generic effect.