A colloquial phrase used in some Latin American countries, especially in Mexico, which is often used to tell someone to calm down, relax, or stop what they are doing. 'Prieto' is a term used to refer to a person with dark skin or dark features, but in this slang term, it does not necessarily refer to someone's physical features.
Examples
- Spanish: 'Quieto prieto', no te alteres, todo estará bien.
- English: 'Easy there, buddy', don't get upset, everything will be okay.