Source : Webster's Revised Unabridged Dictionary (1913)

Boomer \Boom"er\, n.
   1. One who, or that which, booms.

   2. (Zo["o]l.) A North American rodent, so named because it is
      said to make a booming noise. See {Sewellel}.

   3. (Zo["o]l.) A large male kangaroo.

   4. One who works up a ``boom''. [Slang, U. S.]

Source : WordNet®

boomer
     n : a member of the baby boom generation in the 1950s; "they
         expanded the schools for a generation of baby boomers"
         [syn: {baby boomer}]