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8.
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.
von gvanasse32 25. Februar 2013
 
9.
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.
von MoosyPoo 13. April 2010
 
10.
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.
von iAM 14. Dezember 2013
 
11.
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
von dategrape 9. Dezember 2010
 
12.
U do this to a girl u hate when ur about to climax shove her over and the jizz in ur hand and when she tries to get up shove the jizz in her nose and run away it is called this because u humiliate her twice
Dude I double deckered that bitch yesterday
von Hoddy toddy 19. Juni 2014
 
13.
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!
von Tits VanCockslap 3. April 2014
 
14.
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"
von Kelsey15 8. März 2014