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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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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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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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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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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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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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