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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
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Upper decker delux

The act of sharting in public and then taking your shit pasted underwear off and disposing of it in the tank of the toilet
Man 1. Boo boo has been gone for awhile

Man 2. He's probably taking a shit

Man 1. He farted before he left so likely

Person in question....we need to leave

Later admits he put his shitty underpants in the tank of the toilet of a public setting to avoid being embrassed

Now their shit covered under pants are worse then discovering actual shit in the tank

The upper decker delux
by Takindumps4200 June 28, 2022
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Reverse Upper Decker

When taking a dump with such tremendous force that it actually pushes the crap up into the tank from the bowl.
Man that Thai food packs a punch - i just had a Reverse Upper Decker in the shithouse!
by Chief Brody April 8, 2010
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jersey upper decker

Same as the standard upper decker except you eat a 20-pack of White Castles first and then take the massive dump in the tank. when the next poor slob flushes, the smell from the dirty water will cause an uncontrollable craving for White Castles.
When my ass was about to explode from that 20-pack of castles I ate, I gave marco's toilet a jersey upper decker.
by berserkers rule February 5, 2010
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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
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Upper Decker Double Blumpkin'

An event when two couples receive phalacio while defecating in the bowl and in the tank.
"Yo Dawg, did you hear Shaniqua was in a Upper Decker Double Blumpkin' last night?'
by mrButters April 23, 2009
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Upper Decker Chowder

After taking a dump in the 'upper' part of the toilet (the tank), the individual is so famished he must dine on his own soup!! Thus..."upper decker chowder"
Man that food Ryan made went right through me...but I wanted to be sure I got all my nutrients so I dined on my own Upper Decker Chowder
by spqrbc August 31, 2010
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