The phrase comes from Russian, where 'ne vau' is a way of saying something is not impressive at all, and the clip circulates as a short reaction sound on meme and soundboard sites rather than as a line from a film or show. Its appeal is its brevity and bluntness: in a feed full of exaggerated hype, a flat 'not wow' feels like a punchline in itself. Creators often use it as the deadpan counterpart to an excited oh my god, wow moment, when a reveal falls flat or a boast does not live up to its buildup.