Top Definition
Designated Ugly Fat Friend
Two hot chicks at a bar will have a really nasty fat ugly bitch hanging out with them, refered to as a "DUFF".

"Wow that fat DUFF is hanging out with those two attractive ladies, too bad."
dari Cobra Minggu, 26 Januari 2003
the type of beer Homer Simpson drinks
pass me another Duff Mo
dari :o) Jum'at, 25 April 2003
Designated Ugly Fat Friend.
That 3rd girl is definitely the duff of the group.
dari G Jum'at, 02 Januari 2004
An abbreviation for 'Designated Ugly Fat Friend'. Often in many large groups of women (usually adolecents) there will be a D.U.F.F. as a means to look better by comparison.
I only hang out with her becuase I need a D.U.F.F., otherwise, she'd be, so, history.
dari B.a.m Selasa, 20 Desember 2005
UK usage

1) Something that's flawed or faulty

2) To duff up, to assault, beat up etc
He sold me a duff DVD so I duffed him up.
dari black flag Senin, 31 Mei 2004
A unattractive female who is always seen with another female who is marginally more attractive. It is usually impossible to score with the hotter female without the duff receiving her fair share of the action.
Damn! I so wanna tap that chick.. but goddamn, she always has that duff Nicole hanging off her. Look at that fat mess!
dari Steve0 Jum'at, 20 Agustus 2004
The Designated (/Dumb) Ugly Fat Friend.

The cock-blocking friend of the hot chick you're trying to hook up with, often the target of the wingman.
I was totally in with this chick and then her D.U.F.F. totally cock-blocked me!

-or-

I'll take her, while you distract her D.U.F.F.!
dari Victory2FuManchu Kamis, 07 September 2006

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