VamPoser
Teens, Tweens & those without any reasonable social skills who "self-identify" with whatever the latest goth and/or vampire "fashion" is "in", and believe that their participation makes them part of something "real", "deep" & "Spiritual". Back in the '80 they were called "Art Fags".
Look at that little VamPoser over there -- just how much glitter is that dude wearing on his skin?
Vamposer
A tween or teen, usually female, who truly believes they will someday be able to achieve vampire status. They are firmly in love with the brothers from The Vampire Diaries, anyone in Twilight, or aspires to become Katherine (also from the Vampire Diaries). Will usually sport a set of fake vampire fangs (especially on Thursday evenings when the Vampire Diaries plays on TV) even though spit flies from their mouths.
Abby and Audrey are vamposers; they have those fake fangs in again.