Boa noite pra vcs tudin is a short Portuguese-language meme greeting that circulates mainly as a shareable voice clip in Brazilian online humour, group chats and short-form videos. Its appeal comes less from a single famous source than from how recognisable and reusable the phrasing is: the informal 'tudin' gives an everyday goodnight a playful, affectionate twist that listeners instantly understand. Because it is brief and easy to drop at the end of a clip, creators keep returning to it as a warm, funny way to say goodbye without a long outro.