A person who is half black/African and half latino. Can be Peruvian, Guatemalan, etc. Does not only refer to Mexicans though Mexicans are included. If the person is male he is called a blatino, and blatina is if the person is female.
Taylor: Did you see that guy?
Jordan: The one over there? (Points.)
Taylor: Don't point!
Jordan: Why not?
Taylor: It's impolite to point at a blalbino.