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A term that was popular in the early 2000's and is an acronym for "designated ugly fat friend." In modern day, this term is only used by douches who can't keep up with current slang, and by stupid ass middle schoolers who think they are the shit because of the 2015 movie of the same title that attempted to resurrect the term and make it "cool."
Stupid Person 1: Why is that ugly bitch hanging out with those hot girls?
Stupid Person 2: She must be the DUFF.
by yoloswagturnupyoo February 27, 2015
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Damn that was a steezy ass kickflip son!
by niggaliciouszor April 29, 2007
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Two hot chicks at a bar will have a really nasty fat ugly bitch hanging out with them, refered to as a "DUFF".

"Wow that fat DUFF is hanging out with those two attractive ladies, too bad."
by Cobra January 26, 2003
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to throw a severe beating to another person or group. Used with mal intent or to beat the ass's of.
"If you don't shut the fuck up, i'm gunna duff your dumb ass"
by DamionFK December 01, 2006
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A simple pudding eaten by 19th century sailors. This was given to the crew once or twice a week at the most if they were working hard, or if the captain wanted to motivate them. Consisted of flour, boiled water, and whatever available fruit or molasses. Considered to be quite a luxury.
Having been unruly, the crew did not receive duff last Sunday.
by electronic_rodent April 13, 2008
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