mudhead: n. Commonly used to refer to a {MUD} player who eats

:mudhead: n. Commonly used to refer to a {MUD} player who eats,
sleeps, and breathes 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, on a MUD, or in a
chat system, all a mudhead will talk about is three topics: the
tactic, character, or wizard that is supposedly always unfairly
stopping him/her from becoming a wizard or beating a favorite MUD;
why the specific game he/she has experience with is so much better
than any other; and the MUD he or she is writing or going to write
because his/her design ideas are so much better than in any
existing MUD. See also {wannabee}.

To the anthropologically literate, this term may recall the
Zuni/Hopi legend of the mudheads or `koyemshi', mythical
half-formed children of an unnatural union. Figures representing
them act as clowns in Zuni sacred ceremonies.
-- The AI Hackers Dictionary