Answer:
Definition: The action or practices of a vampire.
(Not sure if this is a real question, but just rollin with it.)
A vampire is a creature from folklore that subsists by feeding on the vital essence of the living... blood. In European folklore and fairy tales told in the dark of night, vampires are undead creatures that often visited loved ones and caused mischief or deaths in the neighborhoods or towns they inhabited while they were alive.
They're also really creepy.
Have fun with your vampires!