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Similar to a blumpkin, but instead of a blowjob, a rimjob is performed on an individual as they are defecating
"Ben told me his girlfriend tried to give him a blumpkin, but he couldn't get it up, so he settled for a rumkin instead."
by I Love Rumkins July 19, 2018
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Below a lump of shit
A pill of dog shit below that someone that is completely useless.. That person is a rumkin..
by Beer me October 28, 2013
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