DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Rowdy \Row"dy\, n.; pl. Rowdies. [From Rout, or Row a
      brawl.]
      One who engages in rows, or noisy quarrels; a ruffianly
      fellow. --M. Arnold.
      [1913 Webster]