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1.
When you drop a deuce and the water splashes up and hit's your butt hole.
I just dropped the kids off at the pool and got poop splash all over my ass!
by Big Daddy Hammer Fist August 26, 2008
 
2.
A strong statement of disagreement; an exclamation which shows dislike for something.
1.Mother: You have to clean your room.
Son: Poopsplash on that mom.

2.Poopsplash! My baseball team just lost the world series.
by The Supreme1 April 06, 2009