Reverse Upper Decker 

When taking a dump with such tremendous force that it actually pushes the crap up into the tank from the bowl.

Man that Thai food packs a punch - i just had a Reverse Upper Decker in the shithouse!

Reverse Upper Decker by Chief Brody April 8, 2010

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

Double Upper Decker Double Reverse Blumpkin 

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.

Double Upper Decker Double Reverse Blumpkin by doubleupperdeckerdoublereverse October 13, 2019

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