The phrase 'se fala que é ninja' is Brazilian Portuguese slang, roughly meaning 'you say you are a ninja', and it circulates online as a short spoken meme rather than a line from a known film or song. Its humour comes from applying the ninja idea to everyday bragging, so Portuguese-speaking creators use it to mock overconfidence in chats, reaction videos and short-form clips. Because the delivery is casual and conversational, it works well as a WhatsApp-style audio, and its continued sharing depends on that relatable joke rather than any single original video.