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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 07, 2018
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