A sexual act in which a Male/Female defecates on themselves with their legs closed and leaning over an object. Followed by a partner Male/Female that urinates on the fecal matter; causing the feces to slide down between their legs like a Poop Sailboat.
Mr. Van Den Berg's Poop Sailboat caused a rash down the back of his legs, that was visible while he wore shorts.
by Mr Van Den Berg February 25, 2010