The Collaborative International Dictionary of English v.0.48:

Baff \Baff\ (b[a^]f), v. t. & i. [Scot., prob. imitative; cf. G.
   baff, interj. imitating the sound of a shot.]
   To strike; to beat; to make a baff. [Scot. or Golf]
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Baff \Baff\ (b[a^]f), n.
   1. A blow; a stroke; thud. [Scot.] --H. Miller.
      [1913 Webster]

   2. specif. (Golf), a stroke in which the sole of the club
      hits the ground and drives the ball aloft. [Scot. or Golf]
      [Webster 1913 Suppl.]