The line comes from Demon Slayer: Kimetsu no Yaiba and is spoken by Inosuke Hashibira, who repeatedly struggles to remember Tanjiro Kamado’s name. “Kamaboko Gonpachiro” is one of the incorrect names he uses, and the contrast between his certainty and obvious mistake made it a recognizable running joke among fans. Clips of the exchange spread through anime compilations, reaction videos, short-form edits, and fan posts. It remains popular because the phrase is distinctive, easy to recognize, and useful whenever a creator needs an intentionally wrong name.