The phrase comes from Brazilian Portuguese slang, where calma means calm down and piranha is used here as a cheeky, insulting nickname rather than a literal fish reference. This version, noted as the Thal version, circulated as a short shareable voice clip rather than a song or film quote. Its spread came from repeated sharing in chats and short videos, where the recognizable opening works even out of context. It remains popular because the delivery is instantly theatrical, making a normal instruction to relax sound like a meme punchline.