mostly occurs the morning after a heavy drinking session. When someone is sitting on the toilet clearing their bowels and they suddenly have to throw up as well - both "exit pipes" are in full flow as vomit and excrement both leave the body by their respective routes.

Usually accompanied before and after by groans of "oh god" "never again" or "oh shit" and requires someone else to clean up the mess as the double dumper is too worn out to do much more than wipe their ass.
did you here that ? sounds like "Johny" has just done a Double Dumper. I ain't cleaning that up
by Lord of Southfields July 30, 2011
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To men one sitting on top of the other,while faceing each other, on a toilet seat takeing a dump while performing a double dutch rudder
I went into the truck stop bathroom to find in a stall with no doors 2 dudes doing a double dump dutch rudder
by who is huge July 19, 2010
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The double monster dump, abbreviated DmD, is where you dump so big that your dump comes out of the john and takes another dump on top of your dump.
Yo lil cuh, i just took a dump and then in dumped on top of my dump. It was a Double monster Dump.
by P 4 Lyfe August 11, 2018
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two parties gotta poop, one sits normally on the toilet, legs spread, the second sits facing the first, both have a clear shot into the toilet, both poop.
and THATS a double decker dump
by The Turdinator2 February 12, 2011
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When guys at a firehouse invite a girl over to tag team her in the back of a firetruck and proceeding to plant the seed in her. Giving her the name double pumper dump tank.
Chad and brad invited Jessica over to the firehouse one night but little did she know she was about to receive a hard lesson on double pumper dump tank operations
by SlimT69 December 9, 2019
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When you catch your 10 year old cousin blasting rope to fortnite porn at 3:27AM, so in response you join him.
Last night me and my cousin did a double pump cum dump!
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