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Multiple Username Disorder: A condition that compels those inflicted to create a multitude of aliases on websites such as 'IMDb', in order to praise or defend their own message-board posts -- the ultimate goal being to elevate these aliases to becoming the board leaders, and thereby controlling all topics of discussion. Often, the MUD sufferer will create lengthy message-board threads, in which the posts are entirely by his/her imaginary correspondents.
Every freakin' internet discussion board you check-out these days seems to have a minimum of 2 MUD cases trying to monopolize the conversation with either every single banality that pops into their boring, schizoid minds, or squabbling and name-calling as they compete for the same space – Chief Nut-job.
MUD by nom de plumb May 20, 2009
Related Words
In Houston its means the ever so great purple stuff.
Mud by Purple420Drank March 23, 2009
Acronym for Multi User Dungeon.
A text based online multiplayer game format dating back to the early days of the internet, several still popular today.
Have you created a charachter on the MUD yet?
I was up all night mudding online.
MUD by .Justaguy November 5, 2016
Slang for MDMA. "Mud" is a powder form of the drug ecstacy. Is often preferred to ecstasy pills as MDMA is pure, whilst ecstasy pills are often adulterated. It is a popular drug amongst ravers and people who do not trust the purity of pills, and ecstasy in general has always been associated, often by the police and government, with the underground dance music scene.

Other slang names include "mandy".
"Mate you got any mud for tonight? If not looks like we're on the pills again"
mud by Boothy_BW December 13, 2008
Mud is one of those terms that could mean a lot of things. It could mean homework, that purple, the trenches, etc. Depending on the context it can be used as a synonym for lots of words.
Man I can't come out tonight I got too much mud to do.
Cup full of mud I came out the mud.
Mud by GeekALot December 20, 2020