Duff stands for – Designated Ugly Fat Friend. Certainly a very cruel acronym but this actually exists in modern day jargon today among young people. The point of a DUFF is that a DUFF is suppose to be the person that other people go to to try and get into the inner circle of attractive people who are hard to approach. Its a stupid concept but I definitely believe that it exists in the real world.
I went to see this movie thinking that it might be funny or entertaining and for the most part it was stupid, not funny and contained no real entertainment value.
So I recommend that you skip this movie, no matter what your age is.