Nipsumuna 2 appears to be a user-shared internet sound rather than a clip with a clearly documented mainstream origin. No reliable source work, character, or release year is firmly attached to the title, so its spread is best understood through reposts, soundboards, and short-form edits. Sounds like this stay in use because they are brief, easy to drop into videos, and recognizable within smaller online circles. In practice, the title itself often carries as much of the joke as the audio does.