The Collaborative International Dictionary of English v.0.48:

Sclaff \Sclaff\, v. i. [imp. & p. p. Sclaffed; p. pr. & vb. n.
   Sclaffing.] [Orig. uncert.]
   1. To scuff or shuffle along. [Scot.]
      [Webster 1913 Suppl.]

   2. (Golf) To scrape the ground with the sole of the club,
      before striking the ball, in making a stroke.
      [Webster 1913 Suppl.]