/mədhed/
n. Commonly used to refer to a MUD player who sleeps, breathes, and eats MUD. Mudheads have been known to fail their degrees, drop out, etc., with the consolation, however, that they made wizard level. When encountered in person, all a mudhead will talk about is two topics: the tactic, character, or wizard that is supposedly always unfairly stopping him/her from becoming a wizard or beating a favorite MUD, and the MUD he or she is writing or going to write because all existing MUDs are so dreadful!
See also wannabee.