reverse upperdecker blumpkin 

Recieving a blumpkin while taking an upperdecker with the person performing the blumpkin turned around backwards on the toilet sucking you off and simulaneously taking a shit.

That was some fucked up shit last night, I can't believe your mom gave me a reverse upperdecker blumpkin.

reverse upperdecker blumpkin by don von donnie March 17, 2008

Upperdecker Double Blumpkin

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”

Upperdecker Double Blumpkin by Stephen Roche September 21, 2019

Upperdecker double blumpkin deluxe

One person sits on the toilet while the other person stands above him. The person sitting is giving a blowjob to the standing person while both are taking a shit.

I walked in the public restroom and caught my roommate and some stranger doing the upperdecker double blumpkin deluxe.

Upperdecker double blumpkin deluxe by JScrub619 July 4, 2016

A.C. Slater-Upper Decker Blumpkin 

When a man defecates in the top tank of the toilet while receiving oral sex from someone pooping and sitting backwards on the seat.

"Hey girl, my dick is real hard and I noticed that we are both have been farting a lot. Perhaps we should A.C. Slater-Upper Decker Blumpkin"

A.C. Slater-Upper Decker Blumpkin by Juan Perico March 8, 2009

Upper Decker Blumpkin AC Slater 

This act requires both a male and female to perform. A male takes a crap in the upper tank of the toilet while performing a delicate balancing act, and getting his cock sucked, as the female takes a crap on the toilet facing the wrong direction. Much like how AC Slater sits in a chair when he's at the Maxx.

I got my girlfriend so drunk that I was actually able to convince her to perform the Upper Decker Blumpkin AC Slater with me while my buddy hid in the closet and video taped the performance!

Upper Decker Blumpkin AC Slater by GivinHer TheBusiness December 30, 2007

Triple Upper Decker Blumpkin Supreme 

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."

Triple Upper Decker Blumpkin Supreme by vaaleainhoinen January 25, 2009

Upper Decker Reverse Blumpkin Double Dump Out

Taking a dump in the toilet tank while having your dong slobbed by someone sitting reverse on the toilet while they are dumping

Me and my girlfriend totally did a upper decker reverse blumpkin double dump out!

Upper Decker Reverse Blumpkin Double Dump Out by Dick Head Buckaroo September 20, 2015