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.
by Mr. Richard-Finger Tongue September 17, 2015
by Craven Moorecock March 9, 2009
Placing the tip of a penis up to the nostril making a flush, airtight fit and upon ejaculating creating a sensation not unlike a sneeze in reverse.
by Iamash October 14, 2007
The action of emptying your semen into a females mouth, and then quickly grabbing a bottle of Pepsi and pouring some in her mouth, then shaking her head, making her look much like a spewing geyser.
"She had just finished cleaning her room, so I busted a Female Geyser on her, and there was Pepsi-Nut everywhere."
by John Boy December 23, 2003
by Bistratus December 6, 2019
-"Man, I guess it's been a while for him because after I gave him a rubber gasket, it was a stage 5 of The Geyser Effect."
by Ariel87 February 15, 2009
Oh god, Oh god, I'm going to have lactating boner geyser
by Schwing33 May 29, 2015