The Collaborative International Dictionary of English v.0.48:

Pitchy \Pitch"y\, a. [From 1st Pitch.]
   1. Partaking of the qualities of pitch; resembling pitch.
      [1913 Webster]

   2. Smeared with pitch.
      [1913 Webster]

   3. Black; pitch-dark; dismal. "Pitchy night." --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pitchy
    adj 1: of the blackest black; similar to the color of jet or
           coal [syn: coal-black, jet, jet-black, pitchy,
           sooty]
    2: having the characteristics of pitch or tar [syn: pitchy,
       resinous, resiny, tarry]