Butt Geyser 

the splash that enters your butt due to your sphincter not being fully closed, once you drop a hefty turd

"john took a solid dump, one of the turds was so big it gave him a butt geyser"

Butt Geyser by Vladboy11 November 20, 2011

butt geyser 

The act of filling up ones anus with a fluid, typically water from a hose. Then releasing the water like a geyser upon an unsuspecting victims head.

I stuffed cheese curds into my ass hole and then with a medically issued super soaker and careful precision I received an injection of One love Kombucha into my anus. Then during an ugly sweater party, many months later, I pulled down my pants spread my butt cheeks and with the the force of old faithful I shot my cheese curd laced kombucha turd Butt Geyser all over the head of one special party goer ronnathan blox.

butt geyser by Mr. Richard-Finger Tongue October 31, 2015

Yellowstone National Butt Geyser 

The insertion of one's penis into an anus (male or female), followed by the expulsion of urine, rather than ejaculate, into the anal cavity.

She's going to know that she got a Yellowstone National Butt Geyser, once she realizes I had asparagus for dinner.

Yellowstone National Butt Geyser by bonerchugger6969 December 6, 2010

Butt Geiser Surpriser 

Also known as the BGS, this is a loving sexual act in which the giver urinates up the butt of the recipient.

BGS tournaments are also known to occur in some parts of the United States, though the rules of the tournament aren't well known.

I couldn't believe the sensation brought on to me after receiving my first BGS.

After years of BGSing, I have a permanent limp.

Butt Geiser Surpriser by Dave February 12, 2004

Buttgeyser 

Real name of an alcoholic beverage that Americans (and only Americans) refer to as "beer".
The name was supposedly chosen to better reflect the original taste.

Originated from Postal 2.

Jeez dude, you call that beer? That cat piss tastes like Buttgeyser!

Buttgeyser by MasterJoe August 13, 2006