fangirl /ˈfænˌɡɝl/noun 1verb 1forms 3 noun1 •(slang) A female fan who is obsessive about a particular subject (especially, someone or something in popular entertainment media).It's often an all or nothing world for the fangirl who has yet to learn to bridle the imagination. She is notorious for being incapable of passively enjoying stories. — 2016 verb1 •To behave like a fangirl; to be obsequious, star-struck, boy crazy, etc.I bought the magazines, ran home after work, filmed myself flipping through the pages—half legitimately fangirling over the boys, half making fun of people like myself who fangirl over the boys. — 2015 formsfangirled · fangirling · fangirls