Definitions of buff:

• noun:   an implement consisting of soft material mounted on a block; used for polishing (as in manicuring)
• noun:   bare skin

  Example: "Swimming in the buff"

• noun:   a soft thick undyed leather from the skins of e.g. buffalo or oxen
• noun:   an ardent follower and admirer
• noun:   a medium to dark tan color
• verb:   polish and make shiny

  Example: "Buff the wooden floors"

• verb:   strike, beat repeatedly

  Example: "The wind buffeted him"

• adjective:   of the color of buff leather
• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #10383)