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

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 deck grumpy blumpkin 

When a man is taking a shit in the toilet tank while receiving a blowjob from a woman who is shitting into the toilet bowl but reversed and facing the tank.

James Bond went to the Opera and met Bridget Jones, they proceeded to the rest room where they engaged in an Upper Deck Grumpy Blumpkin.

upper deck grumpy blumpkin by MeatBagTaco March 19, 2009

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