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
A brand of cool US Skate shoes.
Yo man, you see those dope Duff Roadrunners? Way Fresh!!
by PHIVOLCS March 24, 2004
the act of locking the door behind you when you arrive to your place to lockout someone who may intrude or barge in unexpectedly.
"Hey did you duff the lock? Yeah man, don't worry I duffed it."
by Pants007 January 20, 2009
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
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
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
(Da Ugly Fucking Friend) A term to describe the less attractive females another female will have in company to make her seem more attractive or just a less attractive friend to more attractive female. (Originating in Bear, Delaware)
Jon: "Hey! did you see that girl that just walked by?"

Brandon: "Which one?"

Jon: "The one in the middle bro!"

Brandon: "Oh yeah, but she's only a 6 on a scale of 1-10 without those DUFFs."

Jon: "Yeah her other friends were pretty ugly."
by Boogey Man Brown October 05, 2011

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