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1.
The act of receiving a blow job while discharging a 360 degree watery splash of feces, also known as diarrhea.
Our blumpkin bet quickly quickly turned into a splashkin after the indian buffet at lunch.

Rob: Why do you get so excited when Jessica gives you a splashkin?

Justin: Because if you tilt your hips just right my shit gets sprayed on her face.

Rob: And that turns you on?

Justin: Just marking my property man.
by cuttycut5 February 22, 2011
 
2.
When a woman is giving you a blumpkin and your turd splashes water on her face.
Becky had to redo her make up after giving Mat a splashkin.
by jjfray July 01, 2009