Multi User Dimension, Multi User Dungeon, Multi User Domain, aka MMORPG (massive multiplayer online roleplaying game) but on a smaller scale. Usually textbased although a few have graphics and/or sounds. Many MUDs have built in themes.
I play addictive MUDs like www.dforces.com.
by Gamer February 1, 2004
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Derogatory term for non-Whites
Muds should be repatriated.
by Osmium November 9, 2006
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Multi-User Dungeon.
Many still use this term to refer to a variety of online RPGs, but for the most part, a MUD is completey text-based. Usually the movement of one's character is bound by 'rooms,' or quadrants of area which determine where you are and what you can interact with. Movement generally uses abbreviations for the cardinal directions (n,s,e,w) and sometimes 'in,' 'out,' 'up,' 'down,' etc.
While macros, keybindings and aliases can be created, from the get-go, most commands are typed in, i.e. STAB RAT or BUY SWORD.
MUDs are mainly critisized for being overtly "nerdy" or requiring too much imagination and typing skill. Usually there critisisms come from nearly illiterate RuneScape junkies or snobbish WoW addicts.
by Ian the Almighty October 5, 2006
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Something that is very ugly. Hence, it is ugly as mud.
"Dirty, smelly, ugly"

OR

When someone does something really dumb and it's not cool at all.
"BOY: You see that girl over there?
she's not wearing makeup today.

GIRL:OMG, she's so mud without it."

That guy tried to do a back-flip and he smashed his face in.
He's mud.
by aguido June 13, 2010
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Mandatory Ugly Dress. Often encountered when appearing in a friend's wedding, bar mitzvah, or other ritualized ceremony.
Jenni is such a bitch; that MUD for her wedding cost me $240!!
by LaraS November 6, 2007
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Tyler- "Hey man, wanna go mudding?"
Mario- "Sure, why not? That sounds fun!"
by flashlonkashlonk May 11, 2010
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