Noun: Sexual Act of Somewhat Questionable Outcome.

Warning: illegal in most Middle Eastern countries; may lead to lowered sense of self worth or acne.

Merhod: During oral sex, hold the back of the head in place and take a hard piss, when the piss comes out of the nose it is a Reverse Waterfall.
You think backdrop is bad? Try a Reverse Waterfall
by The chocolate deer January 12, 2016
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When a female ejaculates so hard her pussy fluid squirts up your chest from your waist.
Last night I fucked a girl so hard that her pussy reverse waterfalled me.
by December 13, 2021
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