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!!
by HDMImurcielago April 14, 2014
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when your dick is up right and cum drips down the wang like magma/lava coming down, some will shoot up like a volcano
My dick was upright and cum started shooting out like a cum volcano
by chris6666666666 June 9, 2009
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A volcano of cum, it's better than saying Cum Dumpster or pool.

Often referring to whores and what not
by Isaak D November 21, 2008
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