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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."
ayon kay Cobra ika-26 ng Enero, 2003
1387 307
the type of beer Homer Simpson drinks
pass me another Duff Mo
ayon kay :o) ika-25 ng Abril, 2003
638 235
Designated Ugly Fat Friend.
That 3rd girl is definitely the duff of the group.
ayon kay G ika-02 ng Enero, 2004
500 221
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!
ayon kay Steve0 ika-20 ng Agosto, 2004
440 295
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.
ayon kay black flag ika-31 ng Mayo, 2004
353 210
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.
ayon kay B.a.m ika-20 ng Disyembre, 2005
190 75
marijuana that has already been run through a vaporizer at least once.
all i've got left to vaporize is some duff from last week, but we can still get pretty high.
ayon kay stoner ika-18 ng Hunyo, 2006
143 73