a sex act where a woman or man with a trachiotomy opening in their throat is performing fellatio. The man ejaculates, the partner swallows and the semen subsequently goes down the throat and out the trach opening, gushing much like niagra falls, with the runoff making its way down the chest.
Hey man, I fucked this chick that had one of those voice boxes, right? well she had some sorta surgery & has this hole in her throat. She sucked my dick & she swallowed. She said it wasn't her first Niagra Runoff.
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After a male ejaculation, and your pee comes out in two different streams, you must make the ultimate decision: which stream will go in the toilet?

The worst is when the most powerful stream changes to the least powerful and you are suddenly powerwashing your wall with piss.
I had a Niagra Fails today at the toilet, the worst part was it's my grandma's.

Niagra Fails just flooded your bathroom.
by StickyFingersINyourMOM August 12, 2011
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when a chick is in the bath and she has the faucet running and she puts her pussy under the running water to achieve orasmic stimulation
niagra falls is a nice and different way to come
by fuck you February 23, 2005
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While a chick is blowing you, you cum in her mouth and tickle her nose so she sneezes and then the cum comes out her nose
sally got The Niagra Nostrils from bill and bill laughed.
by The Nostril King September 10, 2010
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1. A beautiful texas girl in John's eyes who teases him and he will never get; one day John calls her a whore and the next day he's trying to go out with her.

A.K.A. - Kelsie
I hope Niagra Falls is at Zaxby's tonight
by John March 31, 2005
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when a guy takes a diereah on a girls head on watches the drippings drop to her chest
i took the best niagra falls on that hoe
by john 14 August 16, 2006
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