Whilst taking a dump, the force of the turd splashes the water which then gets water all over your ass. That water is "plop water"
So I was taking a dump, real big one, and I got the worst plop water
by PlopWater the IV November 06, 2009
The water from a toilet bowl that splashes against your buttocks after you release excrament.
After releasing a Lincoln Log Mike got plopwater all over himself.
by Voyonov80 June 09, 2015