Source : Webster's Revised Unabridged Dictionary (1913)

Hoodlum \Hood"lum\, n.
   A young rowdy; a rough, lawless fellow. [Colloq. U.S.]

Source : WordNet®

hoodlum
     n : an aggressive and violent young criminal [syn: {hood}, {goon},
          {punk}, {thug}, {tough}, {toughie}, {strong-armer}]