Southern Volcano 

Eruptive bowel movement, to such a degree that it mimics a volcano exploding, but downward.

Dude, I just ate three ex-lax brownies, and I feel a Southern Volcano coming in my near future.

Southern Volcano by Tyson the Bastard May 2, 2006

Testicular Volcano 

When one gets hit in the balls, and ejaculates uncontrollably

Dipshit: Yo dawg, I heard your girlfriend hit you in the balls yesterday.
Herp Nugget: Yeah, I had a testicular volcano for 7 hours...
Dipshit: Holy shit man, can you hook me up with one of those?

Testicular Volcano by Derp McMuff March 21, 2015

Volcano cum 

To cum a large amount in a projectile fashion, straight in the air.

Derek: Yo did you murder that poon last night?
Peter: You bet your ass I did. I volcano cummed everywhere!
Derek: Dude sick!!

Volcano cum by HDMImurcielago April 14, 2014

Mud Volcano 

(n) A sex act which involves someone with diarrhea engaging in receptive anal sex. The removal of erect penis causes a rocket of liquid feces to stream out of the person's asshole. Considered VERY gay in Trinidad.

Roger: What's the number of a good carpet cleaning service?

David: Why?

Roger: I gave this girl a mud volcano last night and there is shit everywhere!

Selfish Michael: Gross!

Mud Volcano by Room'd July 5, 2011

Volcano Strat

When you go in the corner of a room, butt-naked, and lean against it upside-down with your ass against the wall and your back curled against the floor. You then proceed to masturbate, and when you ejaculate, you shoot it into the air in a similar fashion as a volcanic eruption, sometimes into one's own mouth.

Aye man, just hit that Volcano Strat, feeling good.

Volcano Strat by ektooo October 28, 2019

Chinese Volcano 

When your diarrhea is so bad and powerful that it shoots through to the other side of the earth.

After that spicy lunch, I had to run to the bathroom for a Chinese Volcano.

Chinese Volcano by Fautbauxter October 19, 2016

slippery volcano 

the term 'slippery volcano' is used to describe a coital act taking place during menses.

"let's do the slippery volcano. don't worry about the mess, that's what towels were invented for."

slippery volcano by like you want November 8, 2009