Source : Webster's Revised Unabridged Dictionary (1913)

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

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

Sclaff \Sclaff\, v. t. (Golf)
   To scrape (the club) on the ground, in a stroke, before
   hitting the ball; also, to make (a stroke) in that way.

Sclaff \Sclaff\, n. [Scot.]
   1. A slight blow; a slap; a soft fall; also, the accompanying
      noise.

   2. (Golf) The stroke made by one who sclaffs.

   3. A thin, solid substance, esp. a thin shoe or slipper.

Source : WordNet®

sclaff
     n : a poor golf stroke in which the club head hits the ground
         before hitting the ball
     v 1: strike (a gold ball) such that the ground is scraped first
     2: strike (the ground) in making a sclaff