Pierre Zago built a large following in Brazil as a social media comedian, and Sinceramente became one of the phrases most associated with him. The clip spread as a short shareable audio on TikTok, Instagram Reels and WhatsApp, where Brazilian users send it as a ready made reaction instead of typing a reply. Because the Portuguese word is understood across Spanish and Italian speaking audiences too, the sound travelled beyond Brazil. It remains popular as a compact, recognisable reaction for disbelief, exasperation and blunt honesty online.