Fangirl (Noun)
A female, usually between the age of 12 and 19, that is obsessed with a particual fictional character and, in turn, the actor that portrays said character.
Avoid fangirls in large groups, as they do tend to swarm, and if you are unlucky enough to catch them near their object of admiration, cover your ears. They have a bat-like shriek that can be heard from serveral city blocks away.
All haters beware x3
(See also: Stalker in training)