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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
DUFF by Golden_Goddess February 11, 2015
Jim: Bob you are my designated ugly fat friend (DUFF)
Bob: I'm not that fat!
DUFF by z108108 February 18, 2015