When one takes a shit in the upper portion of the toilet. ( the tank ).
mike was really pissed that the land lord was evicting him. So he left him an upper - decker.

Jim wanted to get back at his best friend Steve for sleeping with his girlfriend, so he left him an upper - decker.
TNT- DOUG tarafından 27 Eylül 2006, Çarşamba
When you go in the TOP tank of the toilet. Best used at a party or with an audience.
Aw, man! Someone pulled an upper decker!
Goldgoatturd tarafından 20 Şubat 2009, Cuma
To take a shit in the top of the toilet, therefore when the toilet is flushed, brown water washes the poop down.
"That fuckin bitch wouldn't blow me so I am going to leave her an upper decker"
chops renfer tarafından 22 Ağustos 2006, Salı
Step 1) Make sure nobody's around.

Step 2) Quietly open the lid of the upper-section of the victim's toilet.

Step 3) Quietly place the lid down on the floor.

Step 4) Then take a nice shit in the upper-section of the toilet without letting anybody hear you.

Step 5) Wipe your ass.

Step 6) Place the soiled toilet paper in the upper-section of the toilet or in a drawer or magazine.

Step 7) Slowly lift the lid off the floor with your fingers under it and carefully bring it over to the toilet.

Step 8) Here's the hard part; with your fingers under the lid
slowly place the lid on the toilet. No false moves or you're screwed.

Step 9) Leave and don't let anybody see you. Just bail as quickly as possible.

Step 10) Mission accomplished.
Plumber: It looks like you have feces in your toilet's tank.

Victim: It must have been an upper decker.

Plumber: Yeah right. Its already clear that you're stupid enough to shit in there!
Mike_Litoris tarafından 27 Haziran 2011, Pazartesi
take a shit in the top of someones toilet (where all the toilet guts are)
Valerie was so drunk she did an upper decker in her friends toilet at the party, and everyone smelt it.
valere tarafından 13 Mart 2008, Perşembe
A long home run ball hit into the upper seats of a baseball stadium.
After I caught an upper decker at Busch Stadium, I went to Dan's house where I left a beefy sewer pickle in the tank of his toilet.
porknut tarafından 11 Ağustos 2005, Perşembe
the act of pooping, in th top resiviour part some someone elses toilet.
I just gave Bills toilet an upper decker.
Russ151 tarafından 20 Ekim 2006, Cuma

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