Urban waterfall

An urban waterfall is a natural waterfall located in an urban area that has some man-made changes done to it, such as enclosing the natural creek above or below the falls into a storm sewer or box culvert or the construction of a bridge or road over the creek above the falls. The actual waterfall itself normally has not changed, just its natural surroundings have been changed by man.

Dundas Falls located in Hamilton Canada is an urban waterfall because Spencer Creek above the falls has been enclosed into a large storm sewer pipe as shown on this link:
http://www.conservationhamilton.ca/parks/visit/dundasfalls.asp
(copy and paste)

by Mr. Hamilton Waterfall March 27, 2009

Smartphone Waterfall

When one person in a group checks their smartphone and incites a domino effect of everybody else checking their own phones, thus ending all live discussion.

Andy caused a smartphone waterfall when he checked his email, so nobody noticed the 8 foot juggling clown that danced through the room while balancing on a beach ball.

by WillyPom April 1, 2015

satans sacrificial waterfall

Literally just a girls period.

Is satans sacrificial waterfall gone yet?

by Yeahnahyeah May 12, 2016

Satan's Waterfall

A woman's menstruation

Gabi was really irritated at the world because of Satan's waterfall.

by dil3mma April 24, 2015

Acid Waterfall

Diarrhea that burns. Usually occurring after a hard night of drinking or food poisoning, being sick, etc.

Don't go in the bathroom, I just had an extremely uncomfortable acid waterfall in there. It smells horrible.

by Sammy Garlough July 27, 2008

Tennessee Waterfall

A mullet. Surprisingly, not a depraved way of having sex.. Yet. Oh god.

Oh MAN i wish i had a Tennessee Waterfall like that. But my mom says i'm not allowed, 'cause i finished grade school.

by Mortent August 20, 2009

Scio Waterfall

While you stand and a chick gets on her knees and starts blowing you, you throw up on her. So named for the shitty Oregon town where this first originated.

"Hey, dude, did you finally get Jen to play magician last night?"
"Yeah, but I fucked it up and pulled a Scio Waterfall on her. Apparently she's still trying to wash chunks of the chicken mcnuggets I ate out of her hair."

by Dawber=Turkoglu December 18, 2008