look up any word, like blumpkin:
 
1.
one who is the giver in anal sex. Used to call someone a homosexual.
<b>Get away from me, you rump rider
by john April 10, 2004
 
2.
A term given to a nigger in prison (of the male sex)
Rump riders enjoy giving anal sex to other's of duh same sex
(Also see peter pirate)
See Peter pirate
by Bungho May 14, 2004