The original source and speaker behind this particular clip are not reliably identified. Online, it is commonly searched as “nega nega no mi,” wording that resembles the naming pattern of fictional powers in anime discussions and fan-made jokes. The audio spread through short edits where creators treat the repeated phrase like an attack name, transformation cue, or dramatic reveal. It remains useful because its brief structure fits fast cuts, while the chant-like delivery can turn an otherwise ordinary moment into an exaggerated anime-style gag.