Some one who comits vampric activities (not all the time) such as drinking blood,Out at night,ect.Thats my definition of a vampire.
Personally, I am still in the process of defining it, but I'll tell you what I have so far.
Vampire - A person who Sustains himself or prolongs his life by "Feeding" upon the Aura, Prana, Blood, Energy, or Emotions of another.
I have so many but to put it simple drinx blood dies in daylight cool fashion sense 4 the guys and sexiness from the ladies and all normal cliche crap :)
A blood-sucking immortal. The form (soul) of a dead person superstitiously believed to come from the grave and wander about by night sucking the blood of persons asleep or awake, thus causing their death. Thats my opinion of a Vampire....
To be a wise ass as usual I would say that the government would be my definition of Vampire. They suck suck suck in order to thrive and survive and leave you helpless.