Bianca's (Mae Whitman) 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 (Robbie Amell) and her favourite teacher (Ken Jeong). Together they'll face the school's mean girl (Bella Thorne) and remind everyone that we are all someone's DUFF...and that's totally fine.