upper decker

the act of deficating in the water tank of someones restroom, so when they flush, out comes muddy madness

i just left an upper decker in that starbucks bathroom!

by darby krow February 13, 2010

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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

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Upper Decker

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!

by Goldgoatturd February 20, 2009

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Upper Decky Wine Cellar

Throwing a zynnachino in the top shelf of your lip in the back of your mouth.

Kyle: You pussy throw me a ferb germ I'm tryna fill this upper decky wine cellar

Brad: Suck my nuts pussy I ran out yesterday
Kevin: I got you bro, toss that wintergreen cheddar bob up in the cellar

by wadewiggins October 4, 2023

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When one is frustrated and angered to the point of giving the accused a most-deserved upper decker and feels the need to voice their anger- they must, just before dropping a lung in the toilet tank, shout loudly- "This is Sparta!!!" as spoken in the movie 300. After this is spoken, one would shit with vengeance into the tank.

Angry person- That bitch of a waitress ignored our table for over half-an-hour because they add automatic gratuity to the check, so I will leave them my opinion of their service in their toilet tank in the form of a Spartan Upper Decker.

Friend 5 minutes later- Did you do it?

Angry person- I showed no mercy!

by Litaker April 25, 2011

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