people of the root
Black people, or people of African descent. This term refers to the common presence of roots in many African tribes' diets, as well as the use of roots for medicinal purposes, which is common to many African tribes.
Guy 1: Hey, look, there's a person on the roof.
Guy 2: A person of the root?
Guy 1: No, he's not black.
Guy 2: A person of the root?
Guy 1: No, he's not black.