The phrase comes from informal Brazilian Portuguese internet humour, where 'meu cu' is used as a crude, joking insult rather than a literal statement. As a short voice recording, it spread through WhatsApp groups and soundboard sites, where users keep it ready as a quick reply instead of typing out a joke. Its appeal is the contrast between the friendly opening and the sudden rude ending, a pattern common in Brazilian meme audio. Because it is so short, it travels easily in chats, edits, and reaction videos.