1. Solid waste that is trucked out of sewage treatment plants and delivered to farms as fertilizer.

2. diarrhea.
Who left a load of sludge in the crapper and forgot to flush?
by England phi beta gamma January 27, 2008
Like it's counterpart doom, sludge is another genre of "music" inspired by Black Sabbath. Unlike doom however, which emphasizes slower tempos and dynamic heavy riffs. Sludge emphasizes even slower tempos, repetition and progression.
The Melvins, Godflesh, Boris, Buzzov-en, Isis, Sunn 0))), and Khanate are all excellent sludge bands.
by K` February 11, 2006
Sludge metal (aka Sludge Doom) is a genre of metal that takes inspiration from Doom Metal. Sludge is kind of like the raunchy cousin of Doom. Sludge is very prominent in the South, many of the earliest bands on the scene began there (particularly in New Orleans area) such as Eyehategod. Sludge metal is typically more aggressive than doom, taking inspiration from punk (indeed members of EHG and Down formed Crust punk band Arson Anthem). Lyrical content generally focuses around suffering, drug and alcohol abuse, and politics. Some bands include:
The Melvins
Superjoint Ritual
Weedeater
Buzzov*en
Eyehategod
Rwake (pronounced 'Wake')
Down
Isis
Neurosis
Jesu
Baroness
Crowbar
And many others. Bands such as The Melvins have been credited to have first touched on and inspired the sludge sound, and Eyehategod is generally credited to have broken the scene open.
Me and my buddies were listening to some music and drinking, and not much is better to drink to than some Sludge metal. So I popped in Eyehategod's album Southern Discomfort followed up by Down's A Bustle In Your Hedgerow, and Crowbar's Sonic Excess In Its Purest Form.
by Sludge Swamp September 29, 2008
The poop you have after you drink a bunch of coffee.
I sure enjoy it when I have to take a sludge.
by miss milk December 10, 2010
A thick, soupy substance, usually foul in appearance and/or smell.
A filthy brown sludge ran down the walls of the public bathroom.
by BlastMaster May 20, 2003
A low-life toxic personality who spreads their poison and contaminates the innocent. Sludge is human primordial ooze. Teenage girls often gravitate towards sludge. The sludge soon slimes all over them and the next thing they know the girl's hooked on crack. The trick out stage is next, where Mr. Sludge puts her on the street. She becomes a crack ho and he profits from the dual trade. Advice for dealing with sludge: run in the opposite direction or shoot on sight.
Antwan was a perfect example of sludge when he tricked Sally out.
by MsLi April 01, 2006
Tired and lazy, lack of motivation
Hey Man, I'm on my couch I so sludge right now
by DBird August 29, 2007

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