Informal:
* Amigo/a: This is the most common and general term for friend. It can be used for both male and female friends.
* Cotorro/a: This is a playful and affectionate term for friend, often used for someone you spend a lot of time with and have fun with. It literally translates to "parrot," and it implies that you enjoy talking and joking around with this person.
* Compadre/comadre: This term is used for a close friend or confidant, someone you trust and share a lot with. It literally translates to "godparent," but in this context it refers to someone you have a strong bond with.
* Cuate/cuata: This is a slang term for friend, usually used among young people and in informal settings. It is similar to "dude" or "bro" in English.
* Chido/chida: This term can be used to refer to a friend, but it also means "cool" or "awesome." It's used when you like someone and find them agreeable.
Formal:
* Compañero/a: This is a more formal term for friend, often used in a professional setting. It literally translates to "companion."
It's important to note that the slang used for "friend" can vary depending on the region of Mexico.
Always be mindful of the context and your relationship with the person when using slang terms. It's best to err on the side of caution and avoid using slang if you are unsure.