designated ugly fat friend. that ugly girl thats always with a really hot chick.
Dude, I got the hot one you can have the duff.
by nakka43 April 10, 2009
For ones pancreous to explode or nearly do so. Duffing is extremely painful and will require immediate medical attention to avoid a mild case of death.
1. Oh my god! I think my pancreas is duffing!

2. Man, you better slow down on the drinking, you don't want your pancreas to duff..
by ailsaizzy March 14, 2009
designated ugly friend.- the girl no guy wants to have.

This girl will usually get ignored when out with her hot friend and may be so ugly the wingman won't even touch her- then the cockblocking comes in.

The ugly friend may suffer from some form of facial deformity such as an outrageously large nose which prevents them from anyone finding them physically attractive.

They usually end up nowhere in life due to their unnatractive looks and may become a stalker so watch out.
wow, her friend is hot but that single mother is a real duff.
by jdjdjd5665 December 04, 2008
Acronym meaning designated ugly fat friend. This is the disgusting ugly fat friend that tags along with the hot chicks. Said hot chicks allow this as it makes them look less shallow and more attractive.
Ian: I've been tryin' to get Jenna alone for weeks now, but Bertha's always around.

Shawn: Ew, dude, Bertha's a total DUFF.

Ian: You think you could hold her attention while I talk to Jenna?

Shawn: That depends on how much you're willing to pay me.
by xdanielx August 07, 2008
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
Designated Ugly Fat Friend not to be confused with the fuckin amazing duff mckagan. This person often makes you feel better about yourself when your around them...they make you look good
my friend lindsay is a duff when we go out
by slashsbabe_420 May 25, 2007
A word used when someone is excited by something. Or if you see a fit girl.
Wow, look at Sonia.
Duff!
by TheWorx December 18, 2006

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