Muscly or fit. When you've been working out and got well defined muscles you're looking buff.
Somebody: "Did you see The Who at Live Aid?"

Somebody else: "Yeah, Daltrey was looking quite buff!"
by Makeety Makondo July 23, 2006

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The act of painting over or removing graffiti.
"The city's been buffing my tags and throwups!"
by Thoringerveer October 14, 2014

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Sorta like the term D.U.F.F, meaning designated ugly fat friend, the word B.U.F.F means, black ugly fat friend.
Girl 1: Hey do you want to hang out later?
Girl 2: Yeah! Make sure you call Lisa, shes our B.U.F.F.
Girl 1: Oh, good call, I will see you girls later.
by Steet August 21, 2009

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a cop that loves his job a bit too much.
sgt - aren't you supposed to be on meal?
cop - i was going, but this guy had excessively loud music coming from his car, so i threw out my whopper to write him a summons.
sgt - ...you fucking loser, stop being such a damn buff before people flip your locker.
by flipyoutoo February 15, 2008

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big ugly fat friend. Every group of friends usually has one.
"Why does Sally hang out with them?"
"I don't know man, she's such a B.U.F.F.
by bma1 October 05, 2007

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Big Ugly Fat Fuck. The affectionate nickname pilots gave to the Boeing B-52 Stratofortress. Derived from its sheer size (159 feet long, 185 foot wingspan), and the fact that it is ungainly in appearance on the ramp, due to it's 8 engines and bicycle landing gear.
The B-52 "BUFF" is shown many times in the movie Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb, and flew the world's longest combat sortie in 1991 in support of Operation Desert Storm, launching AGM-86 cruise missiles against high priority Iraqi targets.
by Kiwi90 February 05, 2007

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to suck dick; give head
Yo, she buffed me yesterday in the stairwell.
by quantyn January 24, 2007

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Big ugly fat friend. Usually refers to a freind that makes you look a whole lot better in social situations.
I,m gonna go to the bar this weekend and bring my B.U.F.F. Jeff.
by Denny D. Bat April 13, 2006

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