Having sex with a woman during her period. It tends to be very messy and bloody
"Dude, last night I had volcano sex."

"Oh, how bloody was it?"
"Let's just say I was cleaning up all night."
by MikeMikeMikeMike February 29, 2012
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When you fuck a girl in a car with the heat blasting and then bust a nut on the window.
Chris is a fucking legend! He fucked a girl in the backseat of the car with the heat blasting and nutted on the window. Best volcano sex ever.
by Y2ICON December 8, 2018
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1. sex in a volcano while drinking vinegar
2. a new kind of glory hole, but in a volcano
3. pouring vinegar and baking soda into any orifice and seeing what happens
4. pouring molten lava into any orifice and seeing what happens
1. Hey babe, let’s go have some sex volcano. It’ll be HOT🥵

2. I don’t know what happened to my dick last night, but it was probably the sex volcano.

3. He tried the sex volcano on me last night, and now my vagina is tingly.

4. Steve just fucking died because he tried the sex volcano with Stacy last night.
by H&R Block January 3, 2022
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