Enfia no Cu circulates online as a short Brazilian Portuguese meme sound, shared widely in reaction videos, gaming clips, and chat messages where a crude shout works as a joke. Its appeal comes from the phrase itself, which is blunt, instantly recognisable to Portuguese-speaking audiences, and easy to reuse without context. Because the clip is only a few seconds long, creators can insert it as a sudden interruption, and that brevity has helped it keep travelling between social platforms, group chats, and edited compilations long after its first viral use.