munchkin = M = mung

mundane n.

[from SF fandom] 1. A person who is not in science fiction fandom. 2. A person who is not in the computer industry. In this sense, most often an adjectival modifier as in "in my mundane life...." See also Real World, muggle.

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.