What is "mutton fist"

Mutton \Mut"ton\, n. [OE. motoun, OF. moton, molton, a sheep, wether, F. mouton, LL. multo, by transposition of l fr. L. mutilus mutilated. See Mutilate.]

1. A sheep. [Obs.]
   --Chapman.

   Not so much ground as will feed a mutton.
   --Sir H. Sidney.

   Muttons, beeves, and porkers are good old words for the living quadrupeds.
   --Hallam.

2. The flesh of a sheep.

   The fat of roasted mutton or beef.
   --Swift.

3. A loose woman; a prostitute. [Obs.]

   Mutton bird (Zo["o]l.), the Australian short-tailed petrel ( Nectris brevicaudus).

   Mutton chop, a rib of mutton for broiling, with the end of the bone at the smaller part chopped off.

   Mutton fish (Zo["o]l.), the American eelpout. See Eelpout.

   Mutton fist, a big brawny fist or hand. [Colloq.]
   --Dryden.

   Mutton monger, a pimp. [Low & Obs.]
   --Chapman.

   To return to one's muttons. [A translation of a phrase from a farce by De Brueys, revenons [`a] nos moutons let us return to our sheep.] To return to one's topic, subject of discussion, etc. [Humorous]

   I willingly return to my muttons.
   --H. R. Haweis.