The act of urinating while your penis is fully erect, referred to also as Mount St. Urin, Morning wood surprise, or uncorking the yellow.
Dude, I woke up this morning at full mast and unleashed one helluva geyser under pressure
by Wetbackeralamo69 May 12, 2015
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A sexual move in which liquid nitrogen is inserted into ones anus and in response, they fart out a large cloud of cold air, kind of like a geyser.
Person 1: “Yo dude what’d you do last night?”
Person 2: “Oh it was amazing! Me and my girl tried the Arctic Geyser.”
by clappage December 7, 2018
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the act of putting grape fanta into your partners ass. getting a straw and blowing in making the fanta come out.
Dude, The sex was so good she let me give her the grape geyser!
by ubfrfrg March 6, 2022
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Where you cum in a dudes butt, and then he farts, thus creating a geyser effect.
Man, Adam gave Cameron a San Francisco geyser last night
by Andrew is gy September 13, 2021
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The art of spinning on one's head, like the break dancing move, while having explosive diarrhea.

Spewing your poop upon everything around you while being popin' and fresh.
Someone made a mess in my room. It's like someone did an "80's rumble Geyser" in there.

Most likely. I did one this morning in the McDonald's bathroom.
by Pro-Boner June 28, 2011
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An effect caused by inserting "mentos" and diet soda up ones arse. Very distant cousin to butt chugging
Wow! Thay dude got so hammered last night that we paid him $20 bucks to shove Mentos and diet soda up his ass! It was a total Chocolate Geyser in the living room!
by cowdungminge August 3, 2017
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