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When a man or woman lies flat and begins to form their back into an arch and proceeds to urinate onto their torso, having the pee flow downriver across their body on to their face.
Best performed by people with short necks, for the fully squished face effect.

Not to be confused with the Cinderella Ferris wheel free fall.
Damn I heard rick is a freak, yeah I heard his favourite past time is the backwards waterfall.
by Fat Larry February 13, 2018
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