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.

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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.

The act of pooping in a large body of water (usually the ocean) to avoid using a dirty restroom or digging a hole.

when a small child poops in a large quarentine of water, such as a pool or lake.

A dump in the middle of a big area of water