Aquadump
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."
Aquadump
A dump in the middle of a big area of water
Hey everyone The teacher took an aquadump in the aquarium at animal kingdom!
Aquadump
To take a dump in a small body of water such as a pool, lake, or pond.
Kenny: I got invited to a party at my friends lake cabin, I took an aquadump in the lake and ended up getting kicked out.