Top definition
A young fan, ususally a girl, who shrieks uncontrollably every time a teen idol is seen nearby or at a show.
The tweeny girls became fanshees when the Jonas Brother appeared.
by Momus the Sarcastic September 03, 2009
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2
Obsessive fan of supernatural books and films like Twilight and True Blood.
Jane is a total fanshee. She'd go through Stephenie Meyer's garbage if she could.
by Gambit99 July 04, 2011
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