1 definition by MusicDream

Designated Ugly Fat Friend
The DUFF isn't always ugly or fat, the DUFF is the least attractive friend ( They can still be pretty but not as pretty as the friends) in the group which makes the others look more attractive. The DUFF is the approachable friend in the group who gives intel about the more attractive friends.
"wow i didn't know they knew each other, why is she hanging out with them".
"She's their DUFF of course".
"Oh right yeah i see it".
by MusicDream April 3, 2015
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