DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   bumper
       n 1: a glass filled to the brim (especially as a toast); "we
            quaffed a bumper of ale"
       2: a mechanical device consisting of bars at either end of a
          vehicle to absorb shock and prevent serious damage