Definition: munge

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Source: The Free On-line Dictionary of Computing (2003-OCT-10) 

munge

   /muhnj/ 1. A derogatory term meaning to imperfectly transform
   information.

   2. A comprehensive rewrite of a routine, data structure or the
   whole program.

   This term is often confused with mung and may derive from
   it, or possibly vice-versa.  One correspondent believes it
   derives from the french "mange" /monzh/, eat.

   [Jargon File]

   (2002-04-15)

Source: Jargon File (4.3.1, 29 Jun 2001) 

munge /muhnj/ vt. 1. [derogatory] To imperfectly transform information.
   2. A comprehensive rewrite of a routine, data structure or the whole
   program. 3. To modify data in some way the speaker doesn't need to go
   into right now or cannot describe succinctly (compare mumble). 4. To
   add spamblock to an email address.

   This term is often confused with mung, which probably was derived
   from it. However, it also appears the word `munge' was in common use in
   Scotland in the 1940s, and in Yorkshire in the 1950s, as a verb, meaning
   to munch up into a masticated mess, and as a noun, meaning the result of
   munging something up (the parallel with the kluge/kludge pair is
   amusing). The OED reports `munge' as an archaic verb meaning "to wipe (a
   person's nose)".