Kishibe Rohan is the eccentric manga artist from JoJo's Bizarre Adventure Diamond is Unbreakable, created by Hirohiko Araki. In Japanese, oi is a blunt way to call out hey, and Rohan's repeated delivery turned that everyday interjection into a memorable character moment. Clips of the line circulated on soundboards and in anime edits, where fans isolate the chant from its scene and reuse it as a reaction. Its popularity comes from Rohan's serious tone clashing with the silliness of the repetition.