This clip belongs to the wave of short Brazilian WhatsApp audios that are passed from chat to chat and later uploaded to soundboards, where strangers can reuse the same voice for their own jokes. The phrase itself is everyday Portuguese for calling someone rude, with credo adding a theatrical sigh of disbelief, which makes it easy to understand even without context. Its appeal is that scolding tone: it works as a playful rebuke in friendships, so it keeps circulating as a reaction whenever someone says something too blunt.