While a woman is peeing in the toilet you attempt to pee through her legs into the toilet. Of course this is nearly impossible thus you end up peeing on her urinating vagina thus causing a waterfall. Not typically done for wierd sexual pleasure. Only in the case that you both have to go and the house only has one head.

when you've done something so cringe you can't stop replaying it in your head and it stops you from getting on with your every day life