when you live in a dorm and both you and the people above you are having sex at the same time.
our upstairs neighbors are having a double decker bus with us rn.
by pseudonymforyourname November 18, 2022
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Sex move: when three men are having a threesome and the guy on the bottom is giving anal, the guy in the middle is receiving AND giving anal, and the guy on top is getting anal while his dick/her strap-on flops about like an epileptic fish.
Jerry, we’re gonna do a Triple Decker Pecker Tower later, you want in? If so you’re taking top
by Diddychimken December 27, 2019
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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
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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?
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When you take a dump in a toilets tank
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
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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 5, 2024
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A Decker is a ginger-haired person with a simple comb-over.
This person is loving, forgiving, and cool for the most part.
Back in school, a Decker would study little, but still somehow manage to get almost straight A’s.

A Decker lets few people into their heart. But those people are the most loyal, trustworthy, and funny friends a person could ever have.
Dude, this Decker Guy is so cool!”
by xX_Boss_Xx November 29, 2017
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