Waterfall it 

When someone asks for a drink of something you already put your lips on, the pour it in to their mouth, which looks like a waterfall.

Tyler: Yo dude can i have some of your gatorade?
Dan: Sure as long as you Waterfall it.

Waterfall it by Yu Lik Dik August 22, 2011

It's Like Banging A Waterfall 

A line from the show "Blue Mountain State", the "pocket pussy" episode. A fat guy walks out of a bathroom sweaty as balls with a brown lunch bag, hands it to a guy and a black guy in the background yells it's like banging a waterfall. Best fucking show ever.

"Dude, why are you so sweaty?"
"I just got done fucking this pocket pussy man, It's like banging a waterfall!"

It's Like Banging A Waterfall by wtfaustin. January 19, 2010

italian waterfall 

An Italian Waterfall is where the man takes a piss into the woman's ass, then she proceeds to "waterfall" into the mans mouth.

Guy 1: Dude, did you hear about Dave? His girlfriend gave him an Italian waterfall.
Guy 2: Grosss.

italian waterfall by Dickbuttmunch March 28, 2015

waterfalling 

The action of taking a drink out of a bottle without actually touching it with your mouth, usually to avoid spittle left over, or "germs."

Jason: Dude, why are you drinking my soda? That's disgusting, I don't want your germs!
Dave: Hey, don't worry, I'm waterfalling.

waterfalling by xJulia June 22, 2006

Waterfalling 

The act of exploring waterfalls

" I am going waterfalling", meaning one is going out and exploring waterfalls, a new word and phrase Hamiltonians use to explore their over 100 waterfalls in the City.

Waterfalling by Chris Ecklund August 7, 2008

Waterfallin 

When something turns a woman on so much her vagina resembles a waterfall. Often used sarcastically.

That guy's pick up line had me waterfallin like no other.

Waterfallin by faggytastic December 26, 2014

Waterfallin A Drink 

The act of a person downing a drink as fast as possible.

John: Hahaha
James: What?
John: I just made Jill Laugh When She Was Waterfallin A Drink!!
James: Hahahaha

Waterfallin A Drink by Night8640 June 1, 2010