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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.
od uživatele Russ151 20. Říjen 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
od uživatele t-bozz 28. Leden 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.
od uživatele evangelicalathiest 04. Duben 2011
5 5
 
32.
To take a Duce in the upper part of a toilet.
Dude I just took a upperdecker in McDonnells.
od uživatele anal anilllater 29. Březen 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!

od uživatele boiiiiiiiiiiiiiiiiiiiiiiiiiiiie 16. Leden 2006
18 20
 
34.
The Act of taking a shit in the Upper Tank of the toilet as a prank.
I JUST LEFT THEM A UPPER DECKER!!!
od uživatele DaddyFatSizzles 29. Březen 2011
0 3
 
35.
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.
od uživatele David C 12. Srpen 2005
17 20