When you're changing your baby boy and he begins peeing straight up in the air while the old diaper is off and you haven't gotten the new diaper on yet.
by Jojomogir January 28, 2011
Vito: Hey did u hear that Tony gave Kayla an Italian geyser!
Mick: Wow, she must have had a fun cleaning job after that.
Vito: Hell yeah.
Mick: Wow, she must have had a fun cleaning job after that.
Vito: Hell yeah.
by yankees2738 January 02, 2014
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 06, 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