Green’s Dictionary of Slang

prissy n.

[Prissy, the black maid in the book/film Gone With The Wind (1936/1939)]

(camp gay) a black homosexual.

[US]Maledicta IV:2 (Winter) 228: Miss Mabel, Prissy, Butterfly [...] and Snowball, all for a Sheena = black queen (from the comic-book Sheena, Queen of the Jungle).