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2.
The act of ejaculating into one's eyes in goal of blinding and subdoinng cet party and furthermore shoving them down a flight of stairs during process.
"hey guys, did you see mike give mary a mexican waterfall?," "Yeah barry, she's dead!"
by marcol May 10, 2006
 
1.
The act of defecating in a floor length urinal.
Dude, all the toilets were occupied and i really had to go! So i just decided to use the mexican waterfall method!
by BenDrinkin March 09, 2011
 
3.
When a man ejaculates on a woman's breasts and, at the same time, he diarrhea shits on her belly.
I was straight raw-doggin this girl and I just had to Mexican waterfall her.
by Jeff the ejaculator April 29, 2006
 
4.
A depraved scatalogical act for three people. After eating several bowls of chilli and drinking tequilla the protagonist stands naked on a chair and deficates into the mouth of the first partner who is kneeling beneath the chair. This person allows the faeces to overflow and fall down into the mouth of the second partner who is lying on their back on the floor.
"How was your recent trip to Mexico?"
"It was great, I met these two dudes and gave them a Mexican Waterfall!"
by papa poop 2 July 29, 2009