While a girl is sitting on a toilet urinating, another person comes up and urinates on her stomach and or chest. The multiple streams falling into a common pool make a refreshing sound similar to that of a waterfall.
To save time while at a party, I ran into the bathroom while a girl was peeing and tried my best to spray in between her legs. Sadly I frequently missed and ultimately waterfalled her.
by Kevin Lander August 16, 2010
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When you are having sex and just before jizzing whip it out of the hairy dog and cum in a straight horizontal line accross the area between the mouth and nose, she opens her mouth wide and sticks her tongue out. As the jizz slowly slides down into her mouth and then she swallows.
Kanye: Do you know what I did last night with Kim;) ?

Micheal: what!
Kanye: I surprised her with a waterfall! And she was there for ten minutes before the flow finally finished!
by T' up north March 19, 2015
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a massive and uncontrolled release of diarrhea
raph (who has sexual dreams of jason) has waterfalls
by stephen April 19, 2005
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to catch your female partner's cum in your mouth when she squirts and then stream or spit it back onto her or into her mouth
Have you ever squirted in a man's face and then watched him while he is waterfalling onto your tits? I have.
by S'moken July 31, 2010
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The waterfall is when a female squats over a toilet and begins peeing, only to realize afterward that the seat cover was down the entire time. This female will probably have to change her pants and/or her shoes after accidentally pulling this move.
That dubb giving girl not only got the hot karl, but had a Waterfall in the bathroom and had to change her pants, socks, and Ked sneakers.
by KLp and AMp December 15, 2006
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A woman holds open her ass, and her partner pisses inside. After they're done, the woman stands over the partner and pisses in their mouth from her ass. Thus creating a waterfall.
"Yo man, me and muh girl just did the waterfall!"
"How did it taste?"
"Pretty spicy"
by P1ssMonkey March 5, 2020
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