The exact origin of this repeated na chant is not documented, so it circulates mainly as a standalone soundboard clip rather than a confirmed quote from a specific series. Its anime categorisation comes from how creators use it, pairing the high, sing song delivery with animated reactions and manga style edits. Short vocal loops like this spread because they are easy to recognise, easy to cut, and work without context. It remains popular for taunting, ignoring, and playful mocking scenes where a full line of dialogue would slow the joke down.