Faustão, born Fausto Silva, is one of Brazil's best-known television presenters, famous for his high-energy Sunday variety show and his rapid-fire catchphrases. O loco became one of his signature exclamations, a playful way of reacting to something unbelievable, funny or over the top. As clips from his programmes circulated online, Brazilian meme pages, WhatsApp groups and TikTok creators began reusing the shout as a reaction sound, detached from its original broadcast. It endures because it is short, expressive and immediately recognisable, even to viewers who have never watched the full show.