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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.
by Nikolai88 January 12, 2008
4 3
A homosexual, someone who humps ones rump.
I always knew he was a rump humper.
by yesh,, March 18, 2008
7 1
Someone who humps someones ass.
Alex is an offical rumphumper, after she humped hevyns rump in the locker room.
by Alex January 19, 2003
7 3