A rabid breed of human female who is obesessed with either a fictional character or an actor. Similar to the breed of fanboy. Fangirls congregate at anime conventions and livejournal. Have been known to glomp, grope, and tackle when encountering said obesessions.
Hugh Jackman: 'ello.
Fangirl: SQUEEEEEE! *immediately attaches to Jackman's leg*
Jackman: Security!