When you insert a string of anal beads made of mentos into your ass and then butt chug a bottle of Diet Coke.
Allison asked if she could human geyser me this weekend but I’m afraid the soda is going to cause my skin to break out
by EatAssNotAnimals October 11, 2017
Get the Human Geyser mug.
When you take a massive dump and the water in the toilet wets your entire ass
Me: Holy shit dude i just took a crap and it ended up as a shizer geyser
by ToSmartToFarm August 12, 2011
Get the Shizer geyser mug.
While a dude is getting a blumpkin, he drops a turd and leans back so the splash hits the blumpkiner and they get a brown splash in the face.
I gave Sasha the ol' geyser supriser last night, she didn't see it coming. Now her breath smells like my doo.
by King Geyser February 20, 2010
Get the Geyser Supriser mug.
you or your partner grab a beer bottle(longneck) and inserts it into the anus and pours it in the rectum, holds it in for 30 seconds and afterwards unleashing a geyser on the partners face. You have the option of opening your mouth.
The bachelor party was awesome, it ended with a Budweiser geyser. It was like having beer with pulp!
by chema putz July 1, 2011
Get the Budweiser geyser mug.
When you feed your partner laxatives and you piledrive their ass until the diarrhoea explodes out.

Side note: for best results, feed your partner indian or mexican food.
Bro i just took my girlfriend out to taco bell and we're gonna have a chocolate geyser for dessert later.
by Bruhuhuhu November 3, 2017
Get the Chocolate geyser mug.
the act of putting mentos down somebody's asshole and then pouring diet coke down the asshole. Then a chemical reaction occurs causing a stream of fizz to explode out like a geyser.
Tyler: Dude i just totally gave Amanda a Michigan Geyser last night.
Blake: I've done worse to animals.
by WHITBY20 January 9, 2011
Get the Michigan Geyser mug.
This is when you cook for your girlfriend or wife and lace her food with a shitload of laxatives. Your then having anal sex with her and as your about to cum you punch her in the stomach as hard as you can. You cum in her ass then hold on for dear life with your cock still in her ass while her stomach just rumbles. You pull out last second and her ass then erupts violently covering the room in cum and feces.
My wife pissed me off on valentine's day so I cooked her dinner and gave her a muddy geyser.
by Deuce Master December 1, 2014
Get the Muddy Geyser mug.