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/muhng/ (MIT, 1960) Mash Until No Good.

Sometime after that the derivation from the recursive acronym "Mung Until No Good" became standard. 1. To make changes to a file, especially large-scale and irrevocable changes.

See BLT.

2. To destroy, usually accidentally, occasionally maliciously. The system only mungs things maliciously; this is a consequence of Finagle's Law.

See scribble, mangle, trash, nuke.

Reports from Usenet suggest that the pronunciation /muhnj/ is now usual in speech, but the spelling "mung" is still common in program comments (compare the widespread confusion over the proper spelling of kluge).

3. The kind of beans of which the sprouts are used in Chinese food. (That's their real name! Mung beans! Really!)

Like many early hacker terms, this one seems to have originated at TMRC; it was already in use there in 1958. Peter Samson (compiler of the original TMRC lexicon) thinks it may originally have been onomatopoeic for the sound of a relay spring (contact) being twanged. However, it is known that during the World Wars, "mung" was army slang for the ersatz creamed chipped beef better known as "SOS".
This article is provided by FOLDOC - Free Online Dictionary of Computing (


Pronounced "mung-ing" or "munj-ing," it is the intentional alteration of the sender's "from" address in an email or Usenet message in order to prevent spam. Programs (bots) cull addresses from servers all over the Internet to add to mailing lists. In order to prevent software from automatically grabbing their addresses, some users mung them so that they cannot be used intact.

Munging is not always condoned. Using invalid sender addresses may violate the rules of some newsgroups and service providers.

Munging Example
The email address could be munged into hunter(AT)computerlanguage(DOT)com or hunter@c-o-m-p-u-t-e-r-l-a-n-g-u-a-g-e.c-o-m. Anyone receiving a message from him and wishing to reply would have to demung the address manually before sending a response.
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References in periodicals archive ?
However, there was a significant negative correlation between the mean root characteristics of mung beans and lactic acid concentration.
Shoot Growth Characteristics: Results showed that the shoot measurements defined as shoot length, shoot fresh weight and dry weight of mung beans were affected when exposed to the different concentrations of lactic acid.
In this study, the inhibitory effects of different levels of lactic acid on the growth and morphological characteristics of mung bean were noted, but there appeared to be a tolerant concentration threshold at which no significant differences were observed with the control.
Although a 2% concentration of lactic acid inhibited root length of mung bean seedlings when compared to the control, it did not significantly inhibit shoot length and the fresh and dry weight of roots and shoots (Table 1).
On the other hand, the root length of green mung beans tolerated lactic acid up to the 2% level only, whereas those of the yellow mung beans were already inhibited at the same concentration.