mung

[muhng] /mʌŋ/
noun
1.
something disgusting or offensive, especially filth or muck.
verb (used with object)
2.
to make dirty (often followed by up).
3.
to spoil, ruin, or destroy (often followed by up).
4.
Computers.
  1. to make incremental changes to (a file, system, etc.), eventually ruining or destroying the original.
  2. to modify (an e-mail address) in an easily reversible way, to avoid spam.
Origin
1945-50; of uncertain origin
Can be confused
mung, munge.

munge

[muhnj] /mʌndʒ/
verb (used with object), verb (used without object), munged, munging. Computer Slang.
1.
to manipulate (raw data), especially to convert (data) from one format to another:
the munging of HTML content.
Origin
of uncertain origin
Can be confused
mung, munge.
British Dictionary definitions for munged

mung

/mʌŋ/
verb (transitive)
1.
(computing, slang) to process (computer data)
Word Origin
C20: m(ash) u(ntil) n(o) g(ood)
Slang definitions & phrases for munged

mung

noun

Anything nasty; filth; glop: Jones noticed the mung on Lydon's never-brushed teeth/ Fold the table down, and generations of crud and mung appear (1960s+ Students)

verb
  1. (also mung up) To spoil; botch (1960s+ Students)
  2. To make changes, often undesirable ones, in a file (1980s+ Computer)
  3. To destroy: The system munged my whole day's work (1980s+ Computer)

[origin unknown]