The Collaborative International Dictionary of English v.0.48:

Dung \Dung\, v. t. [imp. & p. p. Dunged; p. pr. & vb. n.
   Dunging.]
   1. To manure with dung. --Dryden.
      [1913 Webster]

   2. (Calico Print.) To immerse or steep, as calico, in a bath
      of hot water containing cow dung; -- done to remove the
      superfluous mordant.
      [1913 Webster]