The act of two people pooping on the same toilet at the same time.
Typically, this requires one person to sit on the toilet seat like normal, and the other person to sit on the lap of the first person, using their legs as a typical toilet seat and aiming for the whole between said legs.
Typically, this requires one person to sit on the toilet seat like normal, and the other person to sit on the lap of the first person, using their legs as a typical toilet seat and aiming for the whole between said legs.
“There is nothing gay about a Galveston double decker”
“It was an emergency, and there was only one toilet available, so we pulled off a Galveston double decker”
“It was an emergency, and there was only one toilet available, so we pulled off a Galveston double decker”
by HankFinkle January 18, 2024
Get the Galveston Double Deckermug. 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
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
Get the Upper Deckermug. 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?
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?
by very stinchy vagina master May 29, 2024
Get the Upper Deckermug. 
Wiping cum, penis and ballsack on a face all in one day on separate occasions and as part of a challenge.
by Nemodoneit February 8, 2017
Get the Triple Deckermug. The act of defecating directly in someone's freezer. The result of this poopsicle predicament is whether to chip away at a frozen browntain or unplug the unit and deep clean because everyone knows you're the germophobe you know you are.
Found out Lou slept with my girlfriend and never told me so I left him a polar decker while he was sleeping so it froze solid before he found it.
by WalnutPlatt July 8, 2018
Get the Polar deckermug. by Anarcho Crust Fuck April 4, 2020
Get the Double Deckermug.