In Spanish slang, 'carta' is often used to refer to a person who is very funny or amusing. It's derived from the standard Spanish word for 'letter' or 'card', but in this context, it's used metaphorically.
Examples
- Spanish: Mi amigo Juan es una carta, siempre me hace reír con sus chistes.
- English: My friend Juan is such a 'carta', he always makes me laugh with his jokes.