The Collaborative International Dictionary of English v.0.48:

Munch \Munch\, v. t. & i. [imp. & p. p. Munched; p. pr. & vb.
   n. Munching.] [Prob. akin to mumble: cf. also F. manger to
   eat (cf. Mange), and m[^a]cher to cher (cf. Masticate).
   See Mumble.]
   To chew with a grinding, crunching sound, as a beast chews
   provender; to chew deliberately or in large mouthfuls.
   [Formerly written also maunch and mounch.]
   [1913 Webster]

         I could munch your good dry oats.        --Shak.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "munching":
   appetite, cannibalism, carnivorism, carnivority, carnivorousness,
   chewing, consumption, cropping, deglutition, devouring, devourment,
   dieting, dining, eating, epulation, feasting, feeding, gluttony,
   gobbling, grazing, herbivorism, herbivority, herbivorousness,
   hunger, ingestion, licking, manducation, mastication, messing,
   nibbling, nutrition, omnivorism, omnivorousness, omophagy,
   pantophagy, pasture, pasturing, pecking, regalement, relishing,
   rumination, savoring, tasting, vegetarianism, wolfing



The Jargon File (version 4.4.7, 29 Dec 2003):

munching
 n.

    Exploration of security holes of someone else's computer for thrills,
    notoriety, or to annoy the system manager. Compare cracker. See also 
    hacked off.


The Free On-line Dictionary of Computing (30 December 2018):

munching

   Exploration of security holes of someone else's computer for
   thrills, notoriety or to annoy the system manager.  Compare
   cracker.  See also hacked off.

   [Jargon File]