DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Wild-cat \Wild"-cat`\, a.
      1. Unsound; worthless; irresponsible; unsafe; -- said to have
         been originally applied to the notes of an insolvent bank
         in Michigan upon which there was the figure of a panther.
         [1913 Webster]
      2. (Railroad) Running without control; running along the line
         without a train; as, a wild-cat locomotive.
         [1913 Webster]
         [1913 Webster]