Source : Webster's Revised Unabridged Dictionary (1913)

Slash \Slash\, v. t. [imp. & p. p. {Slashed}; p. pr. & vb. n.
   {Slashing}.] [OE. slaschen, of uncertain origin; cf. OF.
   esclachier to break, esclechier, esclichier, to break, and E.
   slate, slice, slit, v. t.]
   1. To cut by striking violently and at random; to cut in long
      slits.

   2. To lash; to ply the whip to. [R.] --King.

   3. To crack or snap, as a whip. [R.] --Dr. H. More.

Source : WordNet®

slashing
     adj : as if striking with slashing blows; "his slashing
           demon-ridden cadenza"