boo·ty 2 
(btē) also boo·dy (-dē)
(btē) also boo·dy (-dē)n. pl. boo·ties also boo·dies
1. Slang The buttocks.
2. Vulgar Slang
a. The vulva or vagina.
b. Sexual intercourse.
[African American Vernacular English, from obsolete African American Vernacular English booty, body, perhaps alteration of BODY.]