The act of sitting in ones lap while he or she is sitting on the toilet. The individual on bottom produces excrement into the bowl of the toilet while the individual on top produces excrement between the bottom individual's legs thereby creating the "upper" portion of the deck.
*Often confused with an UPPER DECKER, in which one individual produces excrement into the upper tank of the toilet.*
*See also: Upper Double Decker
*Often confused with an UPPER DECKER, in which one individual produces excrement into the upper tank of the toilet.*
*See also: Upper Double Decker
Roommates Ezekiel and Jebediah both consumed too many matzah balls and were locked in a heated stand-off over who may use the toilet first. They decided to compromise and perform a DOUBLE DECKER.
by PapaPete September 29, 2011

Double-decker, or to pull a double-decker, is when a girl is having sex with two men, whereas one is thrusting his manhood in her ass, and the other man is penetrating her vagina. Often done to completely dominate the woman, and/or a symbol of the friendship between two men.
by Christopher Marrow May 12, 2008

Since Roddy wasn't able to make it to our planned threesome with him, me, and his girlfriend, I just got a strap-on and Double Deckered her.
by MoosyPoo April 14, 2010

double decker is the act of shitting in the bowl of a toilet whilst a friend or accomplice upper deckers the same toilet
by Tits VanCockslap May 15, 2014

a classic taco within a taco: placing a fleshlight inside a woman's vagina, then placing penis inside
I was nervous about performing in foreign territory so i requested a double decker
I never touched her, we did a double decker
I never touched her, we did a double decker
by dategrape December 11, 2010

by Adam Smirti June 07, 2007

When you are taking a shit in the upper tank, she's giving you a blumpkin while taking a shit in the bowl.
by The Jake Bush a.k.a. Switch March 30, 2009
