Upper decker

Taking a shit in the top part or tank of the toilet.

He pissed me off so I did a upper decker in his bathroom.

by Ann_Archy September 12, 2018

upper decker

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".

by mark abestin December 18, 2003

Upper Decker

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

by t-bozz January 28, 2013

upper decker

AN ACT OF WAR. To take shit shit (some crazy how) in the upper tank of a conventional toilet. The next flush will be your shit and shit colored water. WARNING: The tank will be saturated with your shit. Hence the WAR about to commence. Do not do this without an immediate exit plan. And a fucking follow up plan of how and why you did such a fucking nasty thing.

I took and Upper Decker and dipped. Because I hate that fuck. And I am also a nasty unhygienic piece of shit whom wanted to fowl their party and embarrass.... fucking however.

by theutopianing September 19, 2012

upper decker

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.

by grind January 16, 2004

Upper Decker

The Act of taking a shit in the Upper Tank of the toilet as a prank.

I JUST LEFT THEM A UPPER DECKER!!!

by DaddyFatSizzles April 14, 2011

upper decker

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!!

by coldbowl June 3, 2007