1. [late 19C] (US) a trunk.
2. [20C+] (US/W.I.) the buttocks [? play on keister n. (1)/keister n. (5)].
3. [1940s+] usu. in pl., the female breasts; occas. buttocks.
4. [1970s] (US) the vagina.
[1990s+] (US black) a woman’s posterior or buttocks.
[1970s+] (US lesbian) of lesbians, vagina to vagina, said of dancing or sexual intercourse.