noun

• (colloquial, usually humorous) A person with habits traditionally ascribed to (literal) vampires, such as heliophobia, being a night owl, having pale skin, and so on.
  "Near-synonyms: heliophobe, goth"
• (colloquial, disrespectful) A person with the medical condition porphyria cutanea tarda, colloquially known as vampirism, with effects such as photosensitivity and brownish-red stained teeth.
• (figurative, derogatory) A person who drains one's time, energy, money, etc.
  "emotional vampire"
• (dated) A vamp: a seductive woman who exploits men.
  ""What followed this decision was exactly what we had expected: Mr. Fox, realizing that the public was tiring of Theda Bara in vampire roles, announced that he would star her in a production of Romeo and Juliet," she illustrated."

verb

• (transitive, figurative) To drain of energy or resources.