The phrase combines Brazilian internet slang, with ixi signalling surprise or distaste and mermão, a contraction of meu irmão, meaning my brother, giving the line its casual, peer-to-peer tone. As a short reaction clip it circulates on soundboards and messaging apps, where Portuguese-speaking creators reuse it to voice disbelief without a long explanation. Its appeal lies in its brevity and recognisable rhythm, which make it easy to drop over a clip, a meme, or a chat reply, keeping the joke immediate rather than over-explained.