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

Upper Decker

When a phish show is so bad, someone jumps from the top tier head first into the audience.

"Brah, are they playing gotta jiboo again? Gawd I'm gonna smoke some sourD then take an Upper Decker'

by MomoDanceSkunkPusky October 18, 2021

upper decker

when u shit on the top deck of the toilet

ima leave a upper decker

by Γρεεκ φεμβοΥ November 26, 2024

Upper Decker Lip Pillow

Common phrase for a nicotine pouch.

Yo bro, can I get an upper decker lip pillow.

by glitched0 August 10, 2023

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.

by Terry O'Raynis April 4, 2023

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