The Collaborative International Dictionary of English v.0.48:

Mammock \Mam"mock\, n. [Ir. & Gael. mam a round hill + -ock.]
   A shapeless piece; a fragment. [Obs.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Mammock \Mam"mock\, v. t.
   To tear to pieces. [Obs.] --Milton.
   [1913 Webster]