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Yo man, you see those dope Duff Roadrunners? Way Fresh!!
by PHIVOLCS March 24, 2004
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The unattractive girl that a hot girl keeps around to make herself and her friends look better. Stands for "Dumb Ugly Fat Friend". THe DUFF tends to be a cockblock or a third wheel. See also "Grenade".
Why do I always get stuck with the DUFF?
by G. Sherman August 11, 2003
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18
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
by Nick November 22, 2004
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19
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!"
by LexDimonds July 31, 2009
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designated ugly fat friend.. everyone has one to make themselves appear more attractive.. mostly females.. gets on boyfriends nerves
girlfriend- "hey tony lets go to the movies tonight"
boyfriend- "ok cool"
girlfriend- "is it ok if kellie comes cuz she has no friends"
boyfriend- "no that fucking duff cant come"
by banana warrior March 28, 2009
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21
Dark brown or black cannabis remaining in a vaporizer bowl after vaporizing. The duff, which still contains some THC, is recycled rather than discarded by stingier enthusiasts.
Whoa, don't toss that duff, man! I'm saving that to make hash.
by John Woods August 25, 2008
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