DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   flasher
       n 1: someone with a compulsive desire to expose the genitals
            [syn: exhibitionist, flasher]
       2: an electrical device that automatically turns a lamp on and
          off (as for an advertising display)
       3: a light that flashes on and off; used as a signal or to send
          messages [syn: blinker, flasher]