DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Hummer \Hum"mer\, n.
      1. One who, or that which, hums; one who applauds by humming.
         --Ainsworth.
         [1913 Webster]
      2. (Zool.) A humming bird.
         [1913 Webster]