It is a word you use for that one friend that you don't like. It means DESIGNATED UGLY FAT FRIEND
Kim: Ugh why is she always hanging around us
Nicki: Yeah she's just a DUFF
Someone who does not give a shit that he is the leader.
Dude! Do something, don't be duff!
bullshit, lying, contempt, vindictive, self serving, me only servitude.
I will not put up with any of your duff jam
A monster tard you work with. Usually nothing good comes out of there mouth. Comparable to douchebag
Duff bag just moves around the office soundung drunk