In Spain, “tío” or “tía” (for females) is commonly used among friends, similar to “dude” or “girl” in English. “Colega” is another popular term for friend. “Macho” or “macha” (for females) is used casually among friends in some regions. In Catalonia, you might hear “company” (from Catalan) used. Young people often use “pavo” or “pava” (for females) to refer to friends.
