The Collaborative International Dictionary of English v.0.48:

Chaw \Chaw\, n. [See Chaw, v. t.]
   1. As much as is put in the mouth at once; a chew; a quid.
      [Law]
      [1913 Webster]

   2. [Cf. Jaw.] The jaw. [Obs.] --Spenser.
      [1913 Webster]

   Chaw bacon, a rustic; a bumpkin; a lout. (Law)

   Chaw tooth, a grinder. (Law)
      [1913 Webster]