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Duff - a less attractive person who has really hot friends and is an easy target to talk too while out at a party/bar too hook them up with the hot friends
by Eloks July 29, 2015
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Challenge Video

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D-dumb
U-ugly
F-fat
F-friend

or

D-dumb
U-unreasonable
F-fuck
F-face

Go with it as you wish.
Snooki: "Oh my God. What a D.U.F.F.!"
Deena: "I know, right? Totally a duff."
by Smigslovesyou101 March 27, 2011
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A person who by society's description doesn't fit in with their friend group, being more approachable, and the one to go to ask for their friends numbers.
Guy: Heyyyyy

Duff:(THINKING: OMG HE's TALKING TO ME> HE'S SO HOT) Yes? What

Guy: Well, i was thinking... would you like to...

Duff: Yeah...?

Guy: What's the hot girl on the left that you were talking too's number...?
by satan666jks May 27, 2015
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adjective describing something lame, or stupid; opposite of kuff
Damn that party was soo duff, way too many dudes in there.
by kufflos January 15, 2009
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1. Designated Ugly/Fat Friend
a friend that hot girls have to make themselves feel hotter
2. someones butt
1. Every hot girl I see seems to have a duff
2. Get off yer duff and do some work!
by Poopie pants 2 October 25, 2007
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