To sit on the top of the toilet and take a dump in it, while a girl is sitting backwards on the bottom. She is taking a dump and wearing a pumpkin on her head while giving you dome.
Friend 1: Heather came over and gave me a double decker reverse pumpkin blumpkin on Halloween.
Friend 2: Dam shes notorious for that.
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When a man is taking a shit in the toilet tank while a female is sitting on the bowl reverse cowgirl taking a shit and sucking his dick then once they are finished they preform a reverse 69 licking each others assholes clean.
Dude last night i got a kentucky upper decker double blumpkin, and my ass has never been cleaner.
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The art of recieving a blowjob from a woman while she is shitting in the bowl of a toilet and you are taking a shit in the tank/cistern of the same toilet at the same time.
"Tony pulled a Triple Upper Decker Blumpkin Supreme on Vicki in our bathroom last night."
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Kick-ass band soon to take over the world...
The Bob Sagat Blumpkin Experience kicks ass...
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Sexual act requiring 4 people. Person 1 sits backwards on the toilet while defecating and gives a blowjob to person 2, who is defecating in the tank of the toilet. Person 1 also gives hand jobs to persons 3 and 4, who are standing on either side of the toilet. Person 2, 3, and 4 high five above person 1's head.
The combination of the double blumpkin supreme, the upper decker, the pterodactyl, and the eiffel tower
Tom: Dude, I saw the nastiest thing, this chick was doing the "double blumpkin upper decker dactyl tower" at that party on Saturday night.
Ted: Wow she must be a freak!
Tom: Yeah, I almost puked!
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The unspoken act of a female performing an upper decker, whilst a male counterpart carries out a defecation in the lower (relative to aforementioned upper deck) deck, whilst eating out the aforementioned female.
Gary and Bruce were both really excited to partake in the sensual act of a Double Upper Decker Double Reverse Blumpkin, but neither one had eaten a large enough meal to carry out the act.
This is when a girl is giving you dome whilst doing an upper decker in your parents bathroom while they are asleep.
Yo cindy gave me a upside down double reverse blumpkin supreme in my parnets bathroom while they were asleep
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