1 definition by julian mcqueen

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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