The meaning of buff that we do know about is one that describes a person.

VOA: special.2009.05.17

Know what your traditional reactions are. A person that knows their drugs and the effects of their drugs are in fact the best security against fakes."

VOA: special.2010.03.01

I know who they are connected to who I might know. You have a much richer way of connecting with this person than you otherwise would."

VOA: special.2009.09.14

"I can't think of a person that I know of in the world that used their celebrity status for a greater good than what Manute Bol did.

VOA: special.2010.07.05