a person asking another person of the (well hopefully) opposite sex to basically bite them on the neck or some other place on the body. this is especially popular in the vampiric communuity.
if it is used to the same sex then it means to go fuck off, get the hell away from me, bad idea, try me.
tina bite me now you stupid lard! *tina bites tom* *tom passes out from blood loss*
(this may happen in rare cases)
tom: bite me you stupid hacker (tom has told the hacker it might be a bad idea for him to try and hack him)