simialr to a lung, except water is used instead of a bag. fill bottle with water, puncture near the bottom and let gravity do the rest.
we had a few waterfalls and then passed out on the floor.
by da ging June 6, 2003
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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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a massive uncontrolled release of diarrhea
Raph took a massive waterfall while mary and wu listened in with awe.
by JAson April 19, 2005
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A device that can make you fly. More fun than attending lectures, but feels like your inhaling a molotov cocktail.
Our 18 litre lung was out of commission so Steve constructed a waterfall out of an old cement mixer.
by Our-Man-In-Nantucket January 29, 2004
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when a girl is passed out at a party you drag her into the laundry room, then you pull down your pants stand over her face then pour cold water on her face then she will sit up quickly, right into your ballsack. her ice cold face will give the sensation of a waterfall.
by Dylan Walsh November 20, 2006
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When you hear a guy pissing in a toilet while he's standing up (Which makes a "waterfall" sound). When you DO hear a waterfall, scream "WATERFALL!!!"
Bob: "Is that your dad pissing?"

Billy: "WATERFALL!"
by ROFLCOPTER PERSON FTW October 9, 2011
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