Notun Notun circulates online as a Bengali meme sound rather than a clip with a clearly documented film, song or television source, so its appeal comes from recognition and repetition within Bengali-language humour. The phrase itself means something like new, new, and that simple idea makes it easy to reuse across short videos, reaction edits and social posts. Because it is short and instantly upbeat, creators keep returning to it whenever they want a light, familiar cue for novelty, surprise or a playful change of scene.