The act of lighting a women's pubic hair on fire during sex.
"hey man that bitch has got a nice shaved pussy"

"yea, too bad shes immune to the volcano now..."
by SimonAndGarfunkmasterFlex October 6, 2004
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A code word letting others know that they are cock-blocking your efforts with a young lady.
Dude, volcano. Volllcccaaannnoooooo!!!
by Newbs July 18, 2006
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when a man is about to orgasm, he pulls out his dong, aims it at his lover, squeezes his balls with great force while he is ejaculating, then with one powerful forward stroke on the dong, a large amount of baby gravy explodes all over her.
Right before i was about to call it quits, i volcanoed all over my girlfriend's body
by Agent Cumbubble April 28, 2007
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When three men circle a women. (One inserts in mouth, One inserts in vagina, and other places on middle back) Join hands, forming a volcano. When the man who inserted in the mouth ejaculates, the female than proceeds to spit his baby juice into the air. Resembling an eruption.
Lets do our science project which is to make a volcanoe!!!!
OK! Lets call up shaniqua!
...
ERUPTIONNNNNN!!!!!!!!

by LEOPARD PANTS November 11, 2008
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the shape your asshole make when you grunt to bust ass
my volcano just erupted!
by ass kracker March 13, 2012
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To volcano is to excrete faeces with extreme speed, often in the form of diarrhoea.
Several hours after Frederick overdosed on dietary pills, he volcanoed his pants during a press conference.
by Aexerus January 29, 2011
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when a man or women shits into another persons anus or vagina and then that person pushes with great force to push the shit back out thus, the volcano.
the volcano can be preformed with the ass or vagina facing up into the air, so that the shit goes up rather than down, this method i can also be called the shit fountain.
another method can be to stand up afteer the shit was entered and once in standing possession, force the shit out so its falls, this method can also be known as the shit waterfall.
" oh my god man, i just did a volcano to my girlfriend."
by julian mcqueen March 14, 2010
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