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The act of performing a bowel movement in any body of water, under complete anal submersion. Can also be used as a noun to describe product of said bowel movement. Best done downstream.
Timmy rounded the river bend, preceded by a floating turd. "Dude, where have you been?" I asked him. "There were no bathrooms. Had to pull an aquadump."
by Deeeez Nutts June 10, 2007
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2
When one takes a dump in a large body of water such as a pool or lake while actually in the body of water. this has sub categories of floater and sinker. floaters obviously float, which is a hard task to produce the appropriate density and buoyancy necessary to float.
This is not to be confused with a depth charge which is where one drops feces into a large body of water from outside it such as off a dock or pier.
"I just took a major aqua dump and it was a floater. it had to be the corn I ate earlier."

"Dude, don't depth charge it, if you gotta go, aqua dump it."
by Maria Campos December 01, 2009
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3
The act of pooping in a large body of water (usually the ocean) to avoid using a dirty restroom or digging a hole.
The other day I was surfing with my OCD friend who desperately had to poo. He decided that taking an aqua dump was a much better option than the nearby porta-john.
by chuck0086 July 20, 2009
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4
when a small child poops in a large quarentine of water, such as a pool or lake.
Hey, bobby's takin an aqua dump!
by poopstickJFK October 03, 2004
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5
A dump in the middle of a big area of water
Hey everyone The teacher took an aquadump in the aquarium at animal kingdom!
via giphy
by IJustDamnedU February 28, 2017
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