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D.U.F.F stands for designated ugly fat friend
Kassie wants to feel good about herself so she has a D.U.F.F
D.U.F.F by Nick November 22, 2004
Words you can keep
Literally stands for Designated Ugly Fat Friend. This is the bitch who comes out of no where to cockblock you when you are about to get a chick home with you. She is often recognizable by her fat ass, bad hair and sour disposition. Her main goal of the night is to fend off any advances on her friend so she will have company at the diner when she is stuffing her fat face with an omelet and a side of disco fries while she bitches about anyone and everyone. The D.U.F.F can be defeated with a high level wingman, but you will be expected to return the favor; a job not for the faint of heart. A naked D.U.F.F often smells like a box of crayons.
"Dude, I was about to bag this chick, but then her army of D.U.F.F's came out of no where and pulled her away. She must be a Volleyball player!"

"Did you Fuck the chick at the party?"
"No Fuckhead, I got Duffed!"
D.U.F.F by LexDimonds July 31, 2009
Standsfor:Designated Ugly Fat Friend
The Duff is the girl or boy in the friend group who is always doing there friends homework and does not have a great sense of style, probably wears alot of baggy jeans and is mostly feeling left out,every friend group has a DUFF and the Duff is not really fat just not as cute or cool as the rest of the cliqe and the DUFF has messy hair maybe short
Guy:OMG look it's them
Other guy : wait who's she
Guy: oh she's KENDALL /THE D.U.F.F
D.U.F.F by Cuteuwu97 December 22, 2019

D.U.F.F. 

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.
D.U.F.F. by B.a.m December 21, 2005

D.U.F.F. 

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.!
D.U.F.F. by Victory2FuManchu September 7, 2006

D.U.F.F. 

Designated Ugly Fat Friend---Usually hangs around extremely Hot girls and DUFF's usually tend to be girls themselves
Bruh do u see dat D.U.F.F. hangin wit Jennifer
D.U.F.F. by WM-Dawg March 27, 2008

D.U.F.F. 

1. Dumb Ugly Fat Fuck
2. Designated Ugly Fat Friend (the less harsh defintion)
That we-gotta-go-girl is such a D.U.F.F.
D.U.F.F. by cchriss92 August 3, 2007
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