Upper-decker Double Blumpkin 

A dude sits atop the toilet tank and craps in it, facing forward. A woman (or man, I guess...) sits on the toilet backwards and also crals as s/he performs oral sex on the guy seated atop the tank.

What were you two doing in the bathroom so long?
I expelled every fluid imaginable thanks to getting an upper-decker double blumpkin.

Upper-decker Double Blumpkin by Terry O'Raynis April 4, 2023

Upper Decker Double Blumpkin 

The act of sitting on the top part of a toilet and shitting while getting head by the girl who is strattling towards you on the bottom seat while also taking a dump at the same time.

The raunchiest act of the famous "blumpkin" to the next extreme calling it the Upper Decker Double Blumpkin.

Upper Decker Double Blumpkin by Dante Rau July 20, 2006

Upper Decker Double Blumpkin 

When a man is taking a dump in the tank of a toilet while a female is sitting on the bowl taking a dump while facing him and performing oral sex on him.

Yo I was taking a shit and Tracy want to give me a blumpkin but she also had to take a shit so we did an Upper Decker Double Blumpkin

Upper Decker Double Blumpkin by Roger Podacter September 19, 2010

Upper Decker Double Blumpkin 

The very intimate act in which the male lover delicately removes the top cover on the porcelain tank of a toilet. Next he will mount the the tank and begin to defecate. Now the female lover gently sits on the toilet seat facing her male partner. The act begins when she also compenses to defecate while orally accepting his genitalia.

I knew she was the ONE when she pulled me into the hotel bathroom and introduced me the amazing upper decker double blumpkin.

Upper Decker Double Blumpkin by INFDOC September 9, 2021

Upper Decker Double Blumpkin' 

An event when two couples receive phalacio while defecating in the bowl and in the tank.

"Yo Dawg, did you hear Shaniqua was in a Upper Decker Double Blumpkin' last night?'

Upper Decker Double Blumpkin' by mrButters April 23, 2009

kentucky upper decker double blumpkin 

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.

kentucky upper decker double blumpkin by tootalljen89 November 22, 2011

kentucky jelly doighnut upper decker double blumpkin supreme 

The act of, in this very exact particular order: finding a sexual partner and take them to eat a substantial amount of Taco Bell with you. When you both inevitably need to take a diarrhea shit, do it at the same time, with the submissive sitting on the bowl and the dominant sitting on the opened top tank. During the shit, the submissive will perform oral sex on the dominant. When the dominant finishes on the submissive’s face, they must punch the submissive in the nose to create a mixed fluid of blood and ejaculate on their face. Once both parties complete their shit. They will perform a reverse sixty nine on each other until both anuses are clean. Then the dominant must lick the submissive’s face clean.

Man 1: hey bro, why did you break up with your girlfriend? She seemed really nice.
Man 2: nah bro, she was so selfish, she wouldn’t even do a kentucky jelly doighnut upper decker double blumpkin supreme with me!
Man 1: oh man, I didn’t know that, what a selfish bitch!

kentucky jelly doighnut upper decker double blumpkin supreme by Dr. Heinz Doof August 29, 2021