When your girlfriend breaks up with you while she is also taking a dump.
Stoner 1: "Man, she totally broke up with me while she was taking a dump."

Stoner 2: "Sounds like you fell victim to the classic Double Dump."
by pauldoyleworld February 23, 2015
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When two people squat with their backs against each other and simultaneously take a shit. This positional adds stability to the normal solitary squat one would do when taking a shit anywhere besides a toilet. This can be very effective when in hostile, or bear territory and need someone to watch your back.
Me: Man my stomach hurts
Josh: Mine does too!
Me: Time for a Double Dump! Bring your beer!
by Barnaclebill September 26, 2011
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When there is two (2) cubicles in a bathroom, and both are occupied, in which both occupants are taking a dump.
Man, i just did this sweet work poo, there was some other guy in the other cubicle, so we just double dumped
by JackPackageeeee September 9, 2010
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When you have skipped a shit one day, so that when you poo the following day, it is a double dump.
Furthermore, the first Portion stinks more as it has festered inside you for some time.
Hey Lachlan, I'm gonna be late back from lunch!
Why is that, Falvey?
Oh, I have to have a double dump.
You will be a while, make sure you spray!
by NZAP 9041 December 20, 2010
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when one takes a dump eats it and takes another dump that includes the previous dump infused with the secondary dump
i took a dump, ate it, had mickky d's and then took another dump, witch makes it a Double Dump
by Double Dumper Joe July 31, 2011
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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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You: Hey Billy, did you take a dump and forget to flush.
Billy: Yeah.
You: Well no worries. I took a double dump and it clogged your toilet.
Billy: Cool...thanks man.
by ctub January 30, 2011
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