When a person is Black and Black only. Not mixed with anything at all.
Many are under the impression that PLAIN BLACK will soon be a thing of the past with all the interracial dating/ mating occurring these days.
boy #1: What do you think of Janice?
Boy #2: She's alright, but I wouldn't date her.
boy #1: What's wrong with her?
boy #2: She's Plain Black