Using the restroom, going number one or two in the water tank of a fellow man's toilet. when he flushes the pee or shit flows out.
by douchebagness May 3, 2007
When you shit in someone’s toilet tank. To pull one at a lame party, first eat everything there that doesn’t agree with you. Then go into the bathroom, remove the lid from the toilet, squat over the tank, and release the explosive diarrhea that has surely built up by now. When you are finished, the water in the tank should be brown, and have dozens of lumps of shit in it. Then wipe your ass, putting the used toilet paper in the tank, replace the lid, and leave the party, or stick around to watch the fireworks.
by curlypoo December 24, 2020
by anal anilllater March 30, 2011
The act of taking a shit on wax paper, wrapping it up and putting it in the freezer until solid frozen. Then using the frozen turd as a time delay shit bomb, drop it in the upper tank of a toilette. The Shit Agent will have time to escape and the results won’t happen until hours after he is long gone. Once the shit thaws and someone flushes the toilette, it will fill the bowl with brown water and mission is complete.
I was over Jill’s house and she had a couple people over . I wanted to upperdecker her toilette but didn’t want to get caught. Since I have mad spy skills I used some frozen shit I stashed in her deep freezer and upperdecker 007’d her toilette , giving me plenty of time between the time I left and when Allyson went in and flushed it.
by Stephen Roche October 22, 2017
A man takes the upper-back of the toilet off and sits on it. A woman gives him a blowjob as he takes a crap in the back of the toilet. After crapping and the blow job is done, he puts the lid back on the toilet.
An unsuspecting person comes in later and uses the toilette. When they flush the toilet it fills with brown water from the crap the man took in the upper deck.
An unsuspecting person comes in later and uses the toilette. When they flush the toilet it fills with brown water from the crap the man took in the upper deck.
“I was over Al’s house and I upperdecker double blumpkin’d his toilet. That thing was flowing brown all day”
by Stephen Roche September 21, 2019
Recieving a blumpkin while taking an upperdecker with the person performing the blumpkin turned around backwards on the toilet sucking you off and simulaneously taking a shit.
That was some fucked up shit last night, I can't believe your mom gave me a reverse upperdecker blumpkin.
by don von donnie March 14, 2008
One person sits on the toilet while the other person stands above him. The person sitting is giving a blowjob to the standing person while both are taking a shit.
I walked in the public restroom and caught my roommate and some stranger doing the upperdecker double blumpkin deluxe.
by JScrub619 March 29, 2016