Water plopper 

When a poo is dropped that weighs more than the water but is not buoyant, it propels water into the air going straight up your crack thus cleaning your butt without the need of toilet paper.

Will went to the toilet and let out a water plopper, oops.

Water plopper by Badgerglue March 5, 2009

WaterFlopper 

An individual that loves to Flop around in water like a Fish on a hook

That guy is a hard waterflopper

WaterFlopper by Castle42 May 23, 2020