Opposite of nerf.

For example making something in a computer game stronger.
Undead are too weak! Please buff them!
by LastDay September 11, 2004
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To Remove graffiti or any kind of paintings or advertisments.
they buffed over my mural!!

Damn I just put those Fliers up... Yeah they were buffd.
by DigDug March 08, 2004
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1.Having large muscle mass, and low body-fat percentage. A Usually very well defined physique.

2.Also used to say something is good looking. This cna be a person, item, or an item of apparrel that causes the user to look more attractive.

3.Oral Sex

4.Vast repetition of strokin or spinning with a buffer.
1. I saw this guy at the gym today, and MAN was he buff

2. That shirt makes you look buff.

3.I heard that girl can buff real well

4. To shine the car, Jake used a buffer
by Bartsoe June 12, 2006
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"Buff" means you're over 160+lbs who is cut and actually has muscle that shows. If you are under that weight and only have a six pack you are not qualified to be called buff. In fact you are skinny. So delete those pics of you lifting up your shirt.
Damn Jake is getting buff! Did you see his traps and triceps?! You can see them more defined! Unlike Esteban who is just skinny.
by iWearCutoffs December 27, 2014
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this is when you are trying to define someone or something as extremely attractive or good looking ( derived from the term buff)
" WOW man buffness and a half serious that guy looks fine!"
by omarion's no#1 fan December 08, 2008
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