The act of ejaculating inside a girls vagina or asshole and watching as it FALLS out.
I love when I Niagara Falls my girl.
by Ripp $tarr September 24, 2011
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When a male shits into a female's neck and it falls down her cleavage resembling a waterfall.
Person 1: YO I GAVE THIS NASTY BITCH A HUGE NIAGARA SHITS LAST NIGHT!!

Person 2: oh shit you lucky basterd

Person 1: THE BEST PART WAS I TOOK ABOUT 8 LAXATIVES THAT AFTERNOON
by THE ASS FUCKER July 25, 2010
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When a girl is extremely aroused and gets dripping wet down there in response.
I was talking dirty to my girlfriend and it was like Niagara Falls in her panties.
by AnonJudicator October 29, 2009
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New World Rhyming Slang for Balls ie testicles.
"I can get up mate. That block just clocked me square in the Niagaras"
by Ginger Binger October 22, 2003
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Its what you call when you just keep cummin and cummin and cummin
What the hell boy? It's like Niagra Falls comin' out cho' thang!
by fdgg December 12, 2003
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When a guy is in the process of receiving fellatio and upon climax, ejaculates an excessively large amount of semen upon his partner's face or into their mouth.
Dude, I totally went all Niagara Falls on her face last night!
by SanDiabloBasket September 23, 2010
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The process of two men ejaculating into a diseased females nose, henceforth an aCUMmulation of semen and phlegm rush out the the nasal canal.
by TheAguirres March 8, 2019
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