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To have sex. To engage in sexual acts. To have sex with someone other than your significant other.
All I know is that she better let me buff.
Yea, I buffed that last week.
It's going to be a straight buff session
buff by P.L.3. March 1, 2007
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!"
Buff by Makeety Makondo July 24, 2006

Buff The Dog 

I like to buff the dog of john, chris and robyn.
Buff The Dog by Tops1990 September 19, 2010
1. an onomonapia when air is forced out of the lungs in an uncomfortable fashion.
BBBLLLUUURRRFFFFFF!!!! Haha I blurffed...
blurff by Danifer Rednig September 8, 2011
Apparently no one knows the real meaning of buff.
Buff by sammy1115 June 13, 2015

bear buff 

One who is ecxtremely sexy
Kyle ellis is bear buff
bear buff by emma furniss November 19, 2007