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To leave an Upper Decker in the toilet tank, and to leave a Floater in the bowl. This can either be a two-man job, or performed by a single person who breaks his payload into two segments. The result is that the water in the bowl will be brown, and the water that comes from the tank during a flush will also be brown.
An upper decker wasn't enough for that place, so for good measure I left a double decker.
by inmatarian February 03, 2008
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2
When you take a deuce in the upper tank of the toilet. Leaving the owners to believe the toilet is broken, since the water comes out brown and pieces of fieces. This continues until someone either scoops it out of the upper tank or it dissolves.
Usually happens at mad crazy house parties or when someone mad dogs another person and allows them to use their bathroom.
by Tony April 21, 2004
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3
Taking a crap in the upper part of a toilet, then in the bowl, forcing the owner to flush in dismay, and in stench.
Oh man, I freakin double deckered that toilet, sucks for them!
by Atømicfly December 31, 2004
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4
When you sit on your homie’s shoulders with your nuts in his face and shit through the space in between his legs.
Yo, me and devon dropped a steaming double decker earlier in the church bathroom!
by lads9 September 08, 2018
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5
The act of taking a shit while another is sitting on your lap and shitting simultaneously between your legs.
Perry and Carl both had to shit but only one toilet was available so they performed a double decker.
by gvanasse32 February 25, 2013
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7
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
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
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