Best Friend Upper Decker

Perform an upper decker whilst your best friend shits in the bowl part of the toilet

15+ years friendship recommended, but not requires
"Why were you both in the bathroom?"

"We just best friend upper deckered that bitch"
by Badbtchfr April 11, 2022
mugGet the Best Friend Upper Deckermug.
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.
by Terry O'Raynis April 4, 2023
mugGet the Upper-decker Double Blumpkinmug.

upper decker

Dude: im going to take an upper decker in burger kings toilet.

(Dude upper decks BK)
Later someone takes a piss and flushes toilet: what the!
by mountain high mush September 13, 2014
mugGet the upper deckermug.

Upper Decker

When you take a huge dump into the water tank, hence the name upper decker.

Y'all have probably seen many more definitions and guides, but I'm gonna teach y'all how to do one even better.

1. Follow the typical steps to taking an upper decker and take all neccessary precaution to not get caught.

2. On top of shitting the most horrendous turd you can manage into the water tank, also dump in a significant quantity of high calorie food or drink (like bread, meat, highly sugary drinks, etc). This gives the microbes in the shit food to feed on, making the toilet even more nasty on top of the shit thats in there.

3. Profit
Man, that dude Jim was so mean last night. I can't wait to see the look on his face once he finds out about the Upper Decker Moldy Edition TM I did to his upstairs toilet
by PT118 May 4, 2024
mugGet the Upper Deckermug.

Upper Decker

Chicago slang for whipping out the rumpus maximus, doing a fruity little dance with your tooter, and shitting on one's roof.
Guy 1: he did an upper decker on my roof.
Guy 2: ewww man gross. Give him a Chicago sunroof
Guy 1: yeah I will, gotta get my gut going first though. Wanna get some deep dish pizza?
mugGet the Upper Deckermug.

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