when a guy has to piss really bad and sits on the top of the stairs and a girl sits behind him and uses her legs to squeeze his lower stomach until he totally pisses his pants. The pee flows like a water falls down the steps.
she squeezed the piss out of him at the top of the stone steps and it caused a yellowwater falls.
The act involving two partners in which one partner sits down on the john to take a frank and the other takes a piss between their legs in to the toilet.
dude if you dont finish up quick we're gonna have to pull a yugoslavian water fall
While having sexual intercourse pull out unexpectedly and push your parter off the bed (to the floor) and ejaculate down on them(this will give them the sensation of fallin under a waterfall)
Pam sure was upset about getting hurt when i gave her an aztec water fall.