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29.
the act of pooping, in th top resiviour part some someone elses toilet.
I just gave Bills toilet an upper decker.
por Russ151 20 de Outubro de 2006
25 23
 
30.
The act of defecating inside the water tank of a toilet.

Step 1: Go to the home of your mortal enemy. Ask to use the bathroom.

Step 2: Approach toilet and remove the water tank lid.

Step 3: Step on the sides of the toilet and squat over the water. Carefully take a massive dump. Wipe your ass and dispose of toilet paper in the trash bin.

Step 4: Place water tank lid back on the toilet.

Step 5: Escape.

What happens? With each resulting flush, it will fill the bowl with a chunky brown water. Its the gift that keeps on giving :)
Lady mere mere: Just took a massive upper decker

Bro: Are you serious? Thats messed up. You really know about upper deckers
por t-bozz 28 de Janeiro de 2013
1 0
 
31.
Besides the common definition... A behemoth, often coiling, mass of stool that grows and grows until finally reaching above the water level of a toilet bowl. Known to be associated with binge eating. Kind of like one of those underwater volcanoes that breaks the ocean surface.
I had the munchies so bad all weekend, btw do you have a plunger I took an upper decker in your shitter and it's backed up.
por evangelicalathiest 04 de Abril de 2011
5 4
 
32.
To take a Duce in the upper part of a toilet.
Dude I just took a upperdecker in McDonnells.
por anal anilllater 29 de Março de 2011
14 15
 
33.
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
18 20
 
34.
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
17 19
 
35.
The Act of taking a shit in the Upper Tank of the toilet as a prank.
I JUST LEFT THEM A UPPER DECKER!!!
por DaddyFatSizzles 29 de Março de 2011
0 3