fangirl (plural fangirls)
- (fandom slang) The female equivalent of a fanboy.
Derived terms 
someone devoted to a single subject
fangirl (third-person singular simple present fangirls, present participle fangirling, simple past and past participle fangirled)
- (intransitive) To behave like a fangirl; to be obsequious, star-struck, boy crazy, etc.