chomp

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