The Collaborative International Dictionary of English v.0.48:

Champ \Champ\ (ch[a^]mp), v. t. [imp. & p. p. Champed
   (ch[a^]mt); p. pr. & vb. n. Champing.] [Prob, of Scand.
   orgin; cf. dial. Sw. k[aum]msa to chew with difficulty,
   champ; but cf. also OF. champier, champeyer, champoyer, to
   graze in fields, fr. F. champ field, fr. L. campus. Cf.
   Camp.]
   1. To bite with repeated action of the teeth so as to be
      heard.
      [1913 Webster]

            Foamed and champed the golden bit.    --Dryden.
      [1913 Webster]

   2. To bite into small pieces; to crunch. --Steele.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Champ \Champ\, v. i.
   To bite or chew impatiently.
   [1913 Webster]

         They began . . . irefully to champ upon the bit.
                                                  --Hooker.
   [1913 Webster] Champ

The Collaborative International Dictionary of English v.0.48:

Champ \Champ\, Champe \Champe\, n. [F. champ, L. campus field.]
   (Arch.)
   The field or ground on which carving appears in relief.
   [1913 Webster]

WordNet (r) 3.0 (2006):

champ
    n 1: someone who has won first place in a competition [syn:
         champion, champ, title-holder]
    v 1: chafe at the bit, like horses
    2: chew noisily; "The boy chomped his sandwich" [syn: chomp,
       champ]