One participant is sitting on the upper deck of a Toto Toilet while your partner is sitting on the lower deck; with the seat warmer on and the water blasting against their genitals. The upper decker is receiving Fellatio while both parties are passing a Cleveland steamer.
Guy 1: Gawd! Julia is such a basic bitch, i cannot stand her.

Guy 2: Sure, but at least her parents are rich enough to afford a Toto Toilet.

Guy 1: So?

Guy 2: She totally gave me a Steamy Upper Decker, Double wet Blumpkin
Guy 1: Legendary!
by Throbbin-Rockin-Rod January 24, 2018
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The act of, in this very exact particular order: finding a sexual partner and take them to eat a substantial amount of Taco Bell with you. When you both inevitably need to take a diarrhea shit, do it at the same time, with the submissive sitting on the bowl and the dominant sitting on the opened top tank. During the shit, the submissive will perform oral sex on the dominant. When the dominant finishes on the submissive’s face, they must punch the submissive in the nose to create a mixed fluid of blood and ejaculate on their face. Once both parties complete their shit. They will perform a reverse sixty nine on each other until both anuses are clean. Then the dominant must lick the submissive’s face clean.
Man 1: hey bro, why did you break up with your girlfriend? She seemed really nice.
Man 2: nah bro, she was so selfish, she wouldn’t even do a kentucky jelly doighnut upper decker double blumpkin supreme with me!
Man 1: oh man, I didn’t know that, what a selfish bitch!
by Dr. Heinz Doof August 30, 2021
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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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when you earn 10 bucks, so you try to double it for 20, but then someone robs you by hiding your earned money in an electric guitar.
Person 1: Hey, I’m pretty sure my money got stolen last Tuesday by that guy with the fender guitar

Person 2: Someone probably pulled a double fender decker on you then….
by imfrom2014 February 4, 2022
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U do this to a girl u hate when ur about to climax shove her over and the jizz in ur hand and when she tries to get up shove the jizz in her nose and run away it is called this because u humiliate her twice
Dude I double deckered that bitch yesterday
by Hoddy toddy June 20, 2014
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When a guy is peeing in a urinal while another is peeing in between his legs. (In a heterosexual manner)
Hey bro, we both have to pee and there’s only one urinal. Let’s hit a double decker
by Maddoxault September 7, 2023
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One set of tits on top of another.
I thought that girl had a double decker but it turns out the bottoms were implants.
by whycan'tibeblank November 12, 2008
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