The Collaborative International Dictionary of English v.0.48:

Foul \Foul\, v. t. [imp. & p. p. Fouled; p. pr. & vb. n.
   Fouling.]
   1. To make filthy; to defile; to daub; to dirty; to soil; as,
      to foul the face or hands with mire.
      [1913 Webster]

   2. (Mil.) To incrust (the bore of a gun) with burnt powder in
      the process of firing.
      [1913 Webster]

   3. To cover (a ship's bottom) with anything that impered its
      sailing; as, a bottom fouled with barnacles.
      [1913 Webster]

   4. To entangle, so as to impede motion; as, to foul a rope or
      cable in paying it out; to come into collision with; as,
      one boat fouled the other in a race.
      [1913 Webster]

WordNet (r) 3.0 (2006):

fouled
    adj 1: made dirty or foul; "a building befouled with soot";
           "breathing air fouled and darkened with factory soot"
           [syn: befouled, fouled]
    2: especially of a ship's lines etc; "with its sails afoul"; "a
       foul anchor" [syn: afoul(ip), foul, fouled]