The highest form of house party fuck you like an upper Decker basically but instead it just shitting in the top tank oh someone's toilet you triple in that b****
Example

like if you're talking to some chick at her birthday party and everything's going good like you about play that vagina like a harmonica then her boyfriend shows up then and she starts to diss you out and act like she don't know you that's grounds for automatic upper Triple Decker so you run down to the gas station and fill up on Slim Jims and exlax and go back to the party and drink everything in sight mix it all together and then go to the bathroom and let it rip
by Simmens the strange June 9, 2018
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The act of defecating in the upper tank of a toilet after the consumption and digestion of a "Double Down" sandwich from Kentucky Fried Chicken.
Todd demonstrated his contempt for health and hygiene by performing an Upper Double Decker Down.
by urbanschlager April 7, 2010
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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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One takes a shit in the top tank of a toilet and waits for another person to flush the toilet and watches as the water is a constant brown mess
Someone must have captain upper deckered me, cause i flushed the toilet and shit continued to flow and wouldn't go away
by TheSlippyWaffle April 13, 2015
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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
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