The Collaborative International Dictionary of English v.0.48:

Scud \Scud\ (sk[u^]d), v. i. [imp. & p. p. Scudded; p. pr. &
   vb. n. Scudding.] [Dan. skyde to shoot, shove, push, akin
   to skud shot, gunshot, a shoot, young bough, and to E. shoot.
   [root]159. See Shoot.]
   1. To move swiftly; especially, to move as if driven forward
      by something.
      [1913 Webster]

            The first nautilus that scudded upon the glassy
            surface of warm primeval oceans.      --I. Taylor.
      [1913 Webster]

            The wind was high; the vast white clouds scudded
            over the blue heaven.                 --Beaconsfield.
      [1913 Webster]

   2. (Naut.) To be driven swiftly, or to run, before a gale,
      with little or no sail spread.
      [1913 Webster]

WordNet (r) 3.0 (2006):

scudding
    n 1: the act of moving along swiftly (as before a gale) [syn:
         scud, scudding]