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duff

Designated Ugly Fat Friend

A DUFF doesn't actually have to be fat or ugly, just less attractive than the people they are with

Also, a person can be one of the hottest in one group of friends, and the least hot (and therefore the Duff) in an other group
The duff is the less attractive friend and therefore easier to talk to than the hotter friend you are trying to score
by Astr1767 June 14, 2015
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Side Duff

(1)When you are/are not in a relationship. and have a person you fuck on the side. Side duffs manly are just people who you don't really care about, but just only to fuck.

(2) Someone who likes/loves you a lot and buys you stuff and is always promised sex, but never get any in return.
(1) monica was Bill Clinton's Side Duff
by Pititfulfilth April 1, 2011
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Duff

To scarf down food at a rapid pace; to eat large amounts very fast.
After I smoke, all i want to do is duff and sleep
by Fontaine June 30, 2017
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duff

duff
Duff
Designated. Ugly. Fat. Friend
Ex. Britny is the duff in the group
Lisa and jen are hotties or the atravtive one and britney is ugly and fat compared to them
It can be guys (not alway ugly or fat) lets say they are freshmen and are like wingmen to upperclass men
*They are the ones who the girls go to ask if the jocks or alist guys in the group are single

The 2015 movie "Duff" is about a girl who is the duff in her group of friends at highschool who was unaware that she was the duff and was set oit to change it

"Duff " is not a positive thing to be called
by just a teen in 2k15 March 31, 2015
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Duff

Ian is not a Duff
by QuinnIsAJag January 19, 2020
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Duff

The brand of beer that Homer drinks in the Simpsons.
Duffman approves this definition
by kunemvu February 23, 2020
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come up duff

A person who was a duff in their past and is now a hot glown up masterpiece
Guy 1: Damn heathers a come up duff!
Guy 2: Yah she used to be really ugly but now I really wanna date her
by Em's definitions August 14, 2017
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