The Collaborative International Dictionary of English v.0.48:

Cub \Cub\, v. t. & i. [imp. & p. p. Cubbed (k[u^]bd); p. pr. &
   vb. n. Cubbing.]
   To bring forth; -- said of animals, or in contempt, of
   persons. "Cubb'd in a cabin." --Dryden.
   [1913 Webster]