Rump-thumper 

An idiotic person, often a homosexual.

Valentine is such a rump-thumper!

Rump-thumper by Matt October 27, 2003

rumpthumper 

A person who will hump the shit out of someone's behind, usually until sore. Happens to either males or females.

Can also be used as a compliment, usually to someone who fucks a lot, or is really hot and gets girls.

That guy is such a rumpthumper, or Dude! She just got rumpthumped!

rumpthumper by rumpthumper March 27, 2011

rumphumper 

Someone who likes to plow guys in the ass.

Graham was accused of being a rumphumper when he was caught ass plowing his boss Tad.

rumphumper by Nikolai88 January 16, 2008