Muddy Waterfall

When one urinates through the legs of another person who is defecating.

Pisser: "Bro, I really gotta piss!"

Pooper: "Dude... I'm taking a shit"

Pisser: "Whatever bro, lets muddy waterfall!"

Muddy Waterfall by fuzzedhead May 23, 2011

Cascading Waterfall 

To aim one's penis just right so at the point of ejaculation the stream of sperm flies overhead, narrowly missing the face in a matrix like fashion. Resembling a waterfall.

"Last night I was masterbating and totally shot a cascading waterfall"

Cascading Waterfall by dccougar23 September 22, 2011

Redneck Waterfall 

A mullet. The "business up front, party in the rear" looks like a waterfall cascading down the poor hillbilly's neck and shoulders

1: Dude, did you see the mullet on that guy?
2: Yeah, that thing was a redneck waterfall.

Redneck Waterfall by FoulMonkey September 16, 2013

Shinabe waterfall

when taking a shit at the bar and forgetting to tuck your semi-flaccid penis into the bowl thus spraying urine about your face and pants.

Brad gave himself a shinabe waterfall while taking a shit at the bar.

Shinabe waterfall by Street sweeper October 24, 2015

roaring waterfall 

During oral sex you gag so hard you throw up on your partner.

Last night I gave my husband a roaring waterfall.

roaring waterfall by Ks21 August 18, 2016

sandy waterfall 

When you make a girl cum at the beach

Guy 1: Yeah, we were at the beach and I gave her a sandy waterfall

sandy waterfall by Nerd_With_A_Turban June 2, 2016

Rocky Waterfall 

To have a 'Rocky Waterfall' is to simultaneously urinate while having a dump.

Example 1. "I was so desperate for a wee, that when I was shitting I pissed at the same time. It looked like a rocky waterfall."

Example 2. "I was desperate for some really kinky porn, so I looked up golden showers with scat. What I got can only be described as a rocky waterfall"

Rocky Waterfall by Lord Dangleballs August 13, 2016