The sound comes from Chiikawa, the Japanese manga and anime series centred on small, cute characters living ordinary but often strange lives, and it features Usagi, the energetic rabbit whose loud, cheerful vocalisations have become one of the show's most recognisable traits. Fans began lifting short Usagi sounds for short-form videos and meme edits, where the chant works even without any context from the episode. It has stayed popular because the voice alone signals playful chaos, making it an easy shorthand for excitement, mischief, or a character who is far too enthusiastic for the situation.