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

Boujee Upper Decker

Taking a shit in another person’s essential oil humidifier without telling them. Usually as a form of retaliation in which a classic upper decker just won’t cut the mustard.

“I know I had to get back at that twat waffle after he cheated on me with my sister. So naturally I left him a boujee upper decker when I moved out.”

by Gettin' It.... March 8, 2022

Hipster Upper Decker

The act of defecating in the upper tank of a toilet, exhaling vape into the tank and then sealing it for a honeydew, kiwi, and cool mint surprise!

Thomas left a hipster upper decker in the toilet at the party that was surprisingly refreshing.

by GiantsMartyr January 20, 2018

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

British Upper Decker

To poop on the floor on the top level of a double decker bus.

Someone was in the first level bathroom so Becky pulled a British Upper Decker.

by @catfur June 28, 2012