Double Decking 

The act of releasing a bowel movement on top of another bowel movement.

Double Decker
Bismark

It was no surprise that Steve was double decking in the public bathroom.

Double Decking by Frank the Tank 2 August 6, 2011

Double Decking 

Taking a dump into the toilet tank so when a person flushes the toilet they are astonished to see a turd come down.

Marlene was shocked at the Omega Mu House party when she flushed the toilet and a big nasty frat boy turd came down and she realized that she had been the victim of double decking.

(WARNING: Do not try this. You could easy break a toilet. )

Double Decking by Zoro the Ass Bandit April 2, 2013

Double Decking 

you and a friend both fucking girls on a bunk bed in a synchronized manner

Bob and Alex double decking dimes on bunk bed in tune

Double Decking by Rage-hard and no regard November 19, 2011

Double decking 

Two people farting within a small space of each other

Damn bro I could barely breathe in the car when Dan and Samantha were double decking last night

Double decking by Lilbodega March 5, 2018

Double Docking

The act of two uncircumcised men placing the head of their penis's inside the foreskin of the other penis at the same time.

Patty injured his foreskin while double docking Wilke.

Double Docking by Dockee December 9, 2008

Double Dicking 

Dobule dicking is the slang term to double penetration.

Me and my pal nathan were double dicking her all night long!

Double Dicking by boderickp December 13, 2008

Double Docking

The act act of one man rolling back his foreskin and allow another man to roll his foreskin over the first mans exposed penis head. the first man then rolls his foeskin overtop the other forseskin effectively locking the 2 penises together in a chineeese finger trap connection.

Matt and Damon got stuck in a double docking scenario where all peaople involved had a very good time.

refer also to docking

Double Docking by MarkyMark1234 January 10, 2010