An Irish Waterfall is whilst smoking you inhale the smoke and then open your mouth, whilst doing this the smoke will rise up out of your mouth. As the smoke is rising out you inhale back through your nose which will the take the smoke from your mouth back into you throat and lungs recycling it.
Snoop Dogg is seen quite often hittin an Irish Waterfall.
Its hard to execute and when its done right its of tha hook!

"yo hit an Irish Waterfall for me homey!"
or
"Sweet Irish Waterfall!"

Irish Waterfall by Dan-Hulk October 22, 2006

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Belgian Waterfall

A Belgian Waterfall is when a guy ejaculates in his partners mouth then tickles them intensly to the point that the semen shoots out their nose. The same way that orange juice comes out your nose when you laugh.

Alex Willard received a belgian waterfall from Micho the other night and had to go get surgery on his nose.

Belgian Waterfall by Belgian fool February 18, 2010

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dusty waterfall

In the climactic stages of oral shaft pleasures at the top of a well padded staircase, an older male(70+) pulls the shaft out of said face hole and proceeds to swiftly jump kick partner down the staircase while ejaculating in mid air. This action should gain enough force to hit your partner as they fall thus completing the act.

Justin’s grandfather gave me a dusty Waterfall last night and it wasn’t so bad.

dusty waterfall by Kudosthegreat November 16, 2017

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sloppy waterfall

when a male vomits on his partner's breasts and proceeds to motorboat him/her.

I gave Rachel a sloppy waterfall last night! It was messy

sloppy waterfall by Ben Hazafatt Johnson May 17, 2014

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