When two individuals have anal intercourse and the recieving party gets explosive diarrhea.
I was having epic buttsex when there was a vulcanal eruption. The whole room was brown!
by Piemelnokkio May 11, 2015
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Closely related to the shocker. Insertion of the pointer and middle fingers in the vagina and insertion of the ring and pinky fingers in the anus.
I was giving her the shocker but she wanted more, so I stuck my ring finger in her butt and gave her the vulcan.

Vulcanize that ho!
by bruno funkyzeit September 17, 2008
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A word to ask people what they know about it.
by Vulcanator April 30, 2012
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A cross between a Vulture and a Falcon. Like its parents it is a scavenger and is very rare. Native to Brazillian jungles
I saw a vulcan streak across the sky.
by momnkai May 16, 2009
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{verb}.: To penetrate her cunt with your index & middle finger while simultaneously frigging her browneye with the leftover ring & pinky fingers.
2 in the cunt, 2 in the rump
obviously named after that Vulcan, Mr. Spock's hand gesture. come on he was the biggest perv on that show. he showed it to Uhura all the time.
homie: wait you gave her the love gun last night?
me: actually I vulcanized her instead.
she's freaky-deaky dutch like that
by kahda July 19, 2004
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When you put two in the stink and two in the pink just like your giving the vulcan salutation
by Bushido Brown May 17, 2009
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Using two condoms and putting heat cream in between.
Guy: Johnny hooked up with her last night.
Friend: It's OK, I'll just Vulcan.
Guy: What's that?
Friend: Double bag it with heat cream in between. If one breaks, you'll know about it.
by Ageffa April 29, 2010
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