Also known as Fit From Behind. FFB describes the state of shock and disgust at when you see a person(usually a woman) from behind and you are delighted with their curves and shape. It's is not untill they turn around that the phrase comes into act. F.F.B. describes a person who from behind looks rather tastey, yet when he/she turns around end up being what is also known as a minger. Only the phrase F.F.B. can describe the pure emotion of hate, sadness, depression and anti-climax to name a few that is experienced when this occurs to yourself. As of many cases, victims of an F.F.B took such a shock that they gave up all hope on life.
Frank: Ay Bob check out that, rather a juicy peach if you ask me
Bob: I agree what a gif...
Bob: Oh..oh god no..
Frank: She's nastey! what a F.F.B. she was!
Bob: I feel like dieing right now...