the act of taking a dump in the tank of the toilet, AFTER disconnecting the chain AND draining the water. with the hope of drying the shitlog to the bottom of tank,guts and or the float.
my budy forgot my cake on my b-day, so i left one "caked" on his! twas the ol' upper decker delux (dry) f***tard
by jay and nick October 25, 2006
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Verb
The act in which one removes the lid to the tank of a toilet and proceeds to deficate or shit. Once finished, replacing the lid and walking away as if nothing has happened.

End result: Next person flushes toilet and shit is then flushed through.
"Yo dude...I just did a 'Upper Decker Toilet Wrecker' up in that pisser man...hahaha...poor bastards"
by Shaff Dizzle January 05, 2004
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The act of sitting on the top part of a toilet and shitting while getting head by the girl who is strattling towards you on the bottom seat while also taking a dump at the same time.
The raunchiest act of the famous "blumpkin" to the next extreme calling it the Upper Decker Double Blumpkin.
by Dante Rau July 20, 2006
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When a man is taking a dump in the tank of a toilet while a female is sitting on the bowl taking a dump while facing him and performing oral sex on him.
Yo I was taking a shit and Tracy want to give me a blumpkin but she also had to take a shit so we did an Upper Decker Double Blumpkin
by Roger Podacter September 19, 2010
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The act of taking a Shit on the top cover of the tank of the toilet
Nick: Yo man i just took a Shit on Deans Toilet

RoseMarry: Yo you just Super Upper Decker Deluxe His Ass
by Dusty Dean July 27, 2010
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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 22, 2009
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This act requires both a male and female to perform. A male takes a crap in the upper tank of the toilet while performing a delicate balancing act, and getting his cock sucked, as the female takes a crap on the toilet facing the wrong direction. Much like how AC Slater sits in a chair when he's at the Maxx.
I got my girlfriend so drunk that I was actually able to convince her to perform the Upper Decker Blumpkin AC Slater with me while my buddy hid in the closet and video taped the performance!
by GivinHer TheBusiness December 03, 2007
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