Similar to an ordinary blumpkin but in this case the girl A.C. Slater's the toilet and blows the guy as he upper decks the toilet.
Chad and his girlfriend had to shit at the same time, so to kill two birds with one stone she gave him a double blumpkin in her parents bathroom.
by D-Zell June 23, 2011
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When you and a friend achieve the amazing feat of reciving simultaneous blumpkins in a public bathroom.
Guess what happened to me and earl last weekend, we met up with some skanks and got a double blumpkin.
by the duke of all dukes September 26, 2008
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When you and your partner simultaneously shit on each other while 69ing
The other night me and my girl were in the mood, so we decided to double blumpkin
by Space Dock April 1, 2010
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Male is taking an upper decker and the female is sitting reversed on the regular toilet seat taking a shit and giving the guy head.
We really fucked up the toilet at Kieth's house when Sharliene and I did a double blumpkin, Shaeliene is such a dirty girl.
by Thorbeast March 25, 2022
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While receiving a blumpkin, instead of using the toilet to release your shitty load, you use a female or male's mouth. While the other female or male covers the blowjob portion.
by Bigolfattiedoubleblumpkin January 3, 2009
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A man takes the upper-back of the toilet off and sits on it. A woman gives him a blowjob as he takes a crap in the back of the toilet. After crapping and the blow job is done, he puts the lid back on the toilet.

An unsuspecting person comes in later and uses the toilette. When they flush the toilet it fills with brown water from the crap the man took in the upper deck.
“I was over Al’s house and I upperdecker double blumpkin’d his toilet. That thing was flowing brown all day”
by Stephen Roche September 21, 2019
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Receiving oral gratification from a defecating woman while performing an upper deck.
We both had to crap, and she was feeling nasty, so we pulled a double blumpkin supreme
by D-Bone February 24, 2005
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