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An uncontrollable urge by a goth vampire blood-drinking junkie to continuously consume human blood, often times of their equally lame mate. Their unquenchable thirst for blood usually surpasses their willing victim's ability to reproduce blood.
Kenneth: "Dude, let's go play world of warcraft. My mom's not home."
Chase: "I can't dude, I'm totally vampin out."

Allison: "I got the razor. Do you wanna come over?"
Kyle: "No way. Last time you totally vamped out. I had to go to the emergency room."
by Matt Lundberg December 06, 2007
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