The Collaborative International Dictionary of English v.0.48:

Chump \Chump\ (ch[u^]mp), n. [Cf. Icel. kumbr a chopping, E.
   chop.]
   1. A short, thick, heavy piece of wood. --Morton.
      [1913 Webster]

   2. a stupid person; a fool; a dolt; also, a dupe.
      [PJC]

   Chump end, the thick end; as, the chump end of a joint of
      meat. --Dickens.
      [1913 Webster]