When 2 friends upperdecker someone's toilet at the same time.
Justin: Mccaf is such a dick, I'm going to upperdecker his toilet.
Taylor: Dude, me too, let's doubledecker him.
by coldpockets May 12, 2005

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When a man puts on a strap-on above his cock and double penetrates a woman.
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 13, 2010

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When taking a shit, having someone sit on your lap aiming their anus between the first person's legs. Both people shit at the same time, creating a "double" effect and saving water in the process. For utmost efficiency, time the splashes similar to Olympic synchronized diving.
She sat on my lap while I was on the toilet so we could double decker that shit.
by iAM December 14, 2013

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double decker is the act of shitting in the bowl of a toilet whilst a friend or accomplice upper deckers the same toilet
I just double deckered the toilet in the master bedroom with simon!
by Tits VanCockslap April 03, 2014

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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
by dategrape December 09, 2010

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When a person stacks one fist on the other, and aggressively shoves them into a woman's vagina.
"I'm still hurting from his double decker last night"
by Kelsey15 March 08, 2014

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like an upper decker except one shits on the top of the tank lid rather than in the tank
" My boss pissed me off so I snuck into his private bathroom and left him a double decker on his toilet tank."
by Vizualist February 10, 2012

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