The sound comes from JoJo's Bizarre Adventure: Stardust Crusaders, where Noriaki Kakyoin licks a cherry in a memorable scene and produces the rero rero noise while explaining his cherry-licking technique. Clips of the moment circulated widely among anime fans on video platforms and social media, becoming shorthand for playful seduction and mischief. It remains popular because it is instantly recognisable even without visuals, works as a short reaction sound, and connects new viewers to one of the series' most quoted oddball moments.