The phrase comes from Brazilian fan culture around Saint Seiya, the anime adaptation of Masami Kurumada's manga about Pegasus Seiya and the Knights of the Zodiac. The series first aired in Japan in 1986 and became hugely popular in Brazil during its 1990s television run, where its Portuguese dub left many memorable shouted lines. Short reaction clips from that era now circulate on soundboards and in edits, and this mix of disbelief and cheering survives because it captures the exaggerated emotion Brazilian viewers associate with classic shonen battles.