Watch The DUFF movie online on 123movies, Bianca's universe turns upside down when she learns that her high school refers to her as a ‘DUFF' (Designated Ugly Fat Friend). Hoping to erase that label, she enlists the help of a charming jock and her favorite teacher. Together they'll face the school's mean girl and remind everyone that we are all someone's DUFF… and that's totally fine.