BUFF originally refers to the B-52 Stratofortress long-range strategic bomber. The enormous aircraft was extensively used for carpet bombing missions in Vietnam and as a first-strike or retaliatory strike nuclear weapon delivery vehicle during the cold war. The crews rarely referred to the aircraft with its real name, instead they used the acronym BUFF, for Big Ugly Fat Fucker.
The fuckers shot down two of our BUFFs last night during a carpet-bombing run. We need better flight planning!
by BigUglyFatFucker August 14, 2007

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A member of the volunteer public service (EMS, Fire, etc.) who is overly committed to their role, as in one who buys too many emergency lights or owns his/her own personal gear.
"Your car has lights sirens and a booster line? You are such a buff!"
by KC2IHB October 03, 2005

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In the nude or without cloths
He's in the buff
by Andrew July 02, 2003

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Big Ugly Fat Fucker; The nickname given to the B-52 bomber.
We got a BUFF coming in at 12 oclock!
by Jiub May 24, 2003

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Bonafide Ugly Fat Friend
Every hot chick seems to have one, either to make themselves look hotter, or out of sympathy for the said fat friend.
Eugene: What the hell is that thing walking next to Lisa?
Wilbert: That's Lisa's buff.
Eugene: Eww, it's hideous.
Wilbert: You said it Eugene.
by texmexmaster November 01, 2011

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big ugly fat fuck.
from now on, scott will be referred to as BUFF.
by bumbleclot February 04, 2009

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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 January 28, 2007

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