The sound comes from JoJo's Bizarre Adventure, where Noriaki Kakyoin repeatedly says rero rero while rolling a cherry on his tongue. The scene, from the Stardust Crusaders storyline, became one of the series most quoted moments because the delivery is so earnest and strange. Clips and imitations spread widely through anime fandom and meme videos, where the phrase is detached from the original context and reused as shorthand for smug teasing. Its short length and instant recognisability keep it in regular use for edits and reaction posts.