What does it mean when a Mexican says sa?

Answer 1

It's not sa as much as it's s.a. In Spanish it's spelled 'ese.' It literally means 'that' [thing or concept, masculine]. It's mildly disrespectful, and can be highly disrespectful, depending on the status of the person on whom it's used. However, when used among friends, it's like saying, "Dude!" or "Bro'!"

Answer 2

"Sa" is a slang term commonly used in Mexico to mean "okay" or "yes." It is typically used in casual conversations to confirm something or show agreement.