Ratinho is the stage name of Brazilian television presenter Carlos Massa, host of the long-running variety show Programa do Ratinho on SBT, where his energetic reactions and catchphrases became part of Brazilian popular culture. Muito bem, meaning very well, is one of his characteristic expressions of approval, used on air to praise guests, contestants and funny moments. Short clips of his voice later spread through Brazilian social media, WhatsApp groups and meme edits, where the phrase works even for viewers who have never watched the full show.