The Collaborative International Dictionary of English v.0.48:

Chomp \Chomp\, v. i.
   To chew loudly and greedily; to champ. [Prov. Eng. & Colloq.
   U. S.] --Halliwell.
   [1913 Webster]

WordNet (r) 3.0 (2006):

chomp
    n 1: the act of gripping or chewing off with the teeth and jaws
         [syn: bite, chomp]
    v 1: chew noisily; "The boy chomped his sandwich" [syn: chomp,
         champ]

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "chomp":
   bite, bolus, champ, chaw, chew, chew the cud, chew up, chump,
   crunch, cud, gnash, gnaw, gob, grind, gum, masticate, morsel,
   mouth, mouthful, mumble, munch, nibble, nip, quid, ruminate,
   scrunch, snap, swallow



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

chomp
 vi.

    1. To lose; specifically, to chew on something of which more was bitten
    off than one can. Probably related to gnashing of teeth.

    2. To bite the bag; See bagbiter.

    A hand gesture commonly accompanies this. To perform it, hold the four
    fingers together and place the thumb against their tips. Now open and close
    your hand rapidly to suggest a biting action (much like what Pac-Man does
    in the classic video game, though this pantomime seems to predate that).
    The gesture alone means ?chomp chomp? (see Verb Doubling in the Jargon
    Construction section of the Prependices). The hand may be pointed at the
    object of complaint, and for real emphasis you can use both hands at once.
    Doing this to a person is equivalent to saying ?You chomper!? If you point
    the gesture at yourself, it is a humble but humorous admission of some
    failure. You might do this if someone told you that a program you had
    written had failed in some surprising way and you felt dumb for not having
    anticipated it.


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

chomp

    To fail.

   (1996-06-01)