the act of a male individual shitting or pooping in the upper deck of the toilet while a girl goes down on you (aka; sucking your penis), while she releases poop out of her butthole into the lower deck bowl of the toilet.
Jeff to Randy: Dude, bro, Jerry definitely just got some of that double decker blumpkin action dome piece from that random B with the STDs.
Randy to Jeff: Real nice, real fuckin' nice.
Randy to Jeff: Real nice, real fuckin' nice.
by Lambeaux + Jerry November 9, 2008
When someone is doing an upper decker and the person on the lower decker is is giving head and takeing a shit at the same time.
by sick mo'fo December 7, 2012
Takes two people, one takes a dump in the tank of a toilet while the other faces backward on the normal toilet seat dumping while giving the tank dumper head.
Yo, eff those tool bags, they wouldn't give us any beer so Crystal and I pulled a double decker blumpkin in their master bathroom and rolled out! Try flushin that bitches!
by Vern1234 March 10, 2010
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
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
The very intimate act in which the male lover delicately removes the top cover on the porcelain tank of a toilet. Next he will mount the the tank and begin to defecate. Now the female lover gently sits on the toilet seat facing her male partner. The act begins when she also compenses to defecate while orally accepting his genitalia.
I knew she was the ONE when she pulled me into the hotel bathroom and introduced me the amazing upper decker double blumpkin.
by INFDOC September 10, 2021
by mrButters April 23, 2009