1. [20C+] a derog. term for a black person.
2. [1920s+] (also chocolate brown) as used by a black person, thus not derog.
3. [1970s+] the anus, used in the context of defecation and homosexuality.
4. [1980s+] (S.Afr. black) a 20-rand note.
5. [2000s] as black-to-black term of address.
[1980s] (US) a black woman.