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Desiganted Ugly Fat Friend. A common acronym used in male cliques. Used to refer to the girl that the "hot chicks" bring along to distract the "Wingman" (every male clique has one, his job is to intercept the DUFF.) so the ycan have the more desirable males of the group.
"Dude, you sooooo got the DUFF tonight."
Hey, look over there, it’s a duff, why is they walking over here.
Oh look, there’s the duff, haha
Designated Ugly Fat Freind
Jim: Bob you are my designated ugly fat friend (DUFF)
Bob: I'm not that fat!
as in to bone a chick. to get duffed out
i duffed this sweet dude last nite yeahhh!!!
Designated Ugly Fat Friend.
The friend who make her/his friends look good and perfect.
Harry:look at them! The perfect triangle!
Mads: You are right! Spencer, Abby and the other girl.
Harry: haha the duff?
Mads: yes
D.U.F.F a friend that is used to make yourself appear attractive or popular
wow really their friendship group has a duff wow they are so shallow poor duff