When you have a massive deuce that must come out when your at a big party. You remove the top lid to the toilet, and release all the poo into it. When done, put the lid back on, and walk out like nothing happened.
I just put an upper decker in her toilet, HAHA!

There gonna be lookin for that upper decker for weeks,HAHA!

por boiiiiiiiiiiiiiiiiiiiiiiiiiiiie 16 de Janeiro de 2006

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A modification on the "classic" upper decker. In a public toilet setting (where there are no tanks/commodes), you improvise and shit in the urinal.
When Hank got fired from his job, he pulled an upper decker in the company bathroom.
por David C 12 de Agosto de 2005

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Unleashing the biggest load of crap in the top portion of the toilet.
"I wasn't able to get a beer at this party, so I took it upon myself to give him an upper decker in the toilet".
por mark abestin 18 de Dezembro de 2003

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to leave a nice steaming terd on the toilet seat, enhancing the savory odor for the next user of the john; especially irritating to females, dudes not so much. Not to be confused with a Back Door Bandit which involves removing the lid of the reservoir tank and much better balance
eww, gross!!! some fuckwad left a upper decker in there!!!!! take me somewhere to tinkle, dammit!!
por coldbowl 17 de Maio de 2007

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To put toilet paper over someone elses poo when the toilet is clogged and then take a shit on top of the original poo.
I shit on eric's poo because he clogged the toilet and there was nowhere else to go.
por grind 16 de Janeiro de 2004

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(Film Critique). When a movie starts out engaging and has great potential, but then the ending falls apart and the whole thing turns to shit. It's like finding an Upper Decker when you flush your toilet at the end of a party. It's there, and it's shit, you just don't know it yet.
The movie Enemy (2013) was a real Upper Decker.
por Britley's Grams 04 de Setembro de 2016

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