Twihard UK /ˈtwaɪˌhɑːd/US /ˈtwaɪˌhɑɹd/ noun1 •(slang) An avid fan of Stephenie Meyer's Twilight book series or the related films.Getting "Twihards" who love virtuous vampires to buy the soundtrack is easy — but getting Radiohead fans to plunk down cash for a little bit of the "New Moon" universe will be a coup. — 2009 formsTwihards · twihards