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1.
A splash of water from a toilet following a good-sized shit
sitting on the toilet this morning i had a dump that created a toilet-bowl sized tsunami that threw a butt-splash at my arse
by Nico Pelletier July 29, 2007
 
2.
the sprinkling of water you get on your butt when you are sitting on the toilet while it is flushing.
Mostly women get a buttslpash while on the toilet if they flush and dont get up fast enough, or if they flush first and sit down too soon.
Men may get a buttsplash from a crash-landed turd.
by ruralbetter March 19, 2010