The phrase uses Brazilian slang, with mermão as a casual form of meu irmão, meaning my brother, followed by a deliberately vulgar claim meant as an outrageous brag. No verified original recording, speaker, or year is widely documented, so the clip circulates mainly as a detached WhatsApp and soundboard audio. It spread through shares and reuploads where the context was lost, leaving only the abrupt line itself. That anonymity helps it work anywhere, and it remains popular for shock humor, ironic bravado, and derailing chats.