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

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Top Definition
A homosexual, someone who humps ones rump.
I always knew he was a rump humper.
by yesh,, March 18, 2008

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The Urban Dictionary T-Shirt

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Someone who humps someones ass.
Alex is an offical rumphumper, after she humped hevyns rump in the locker room.
by Alex January 19, 2003

The Urban Dictionary Mug

Lotsa space for your liquids.

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Lotsa space for your liquids.

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Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt