A Spanish slang term that is typically used in Argentina, which means 'to become strict or serious, often used when someone starts to enforce rules or regulations'. It can also be used to describe someone who is being a buzzkill.
Examples
- Spanish: Vamos a la fiesta, pero no te pongas la gorra y nos hagas irnos temprano.
- English: We're going to the party, but don't 'put on the cap' and make us leave early.