The poop you have after you drink a bunch of coffee.

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.

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.

Anything mass produced by a capitalist political-economic system (usually the United States) that is intended for mindless consumption. Sludge is generally poor in quality and unhealthy for the consumer. Sludge ranges from media to fast food.

A beverage of any sort that you chug right after taking a huge hit. (mainly a hit from a cannabis)

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

2. diarrhea.

The oh-so-lovely process that sometimes occurs in females about 2 weeks after their periods, in which left overs from the previous period leak out. A sludgy, dark-brown discharge leaks from the vagina and frequently stains underwear; making them look suspiciously shit-stained. Though the flow is not as heavy as a regular period, it is still damn annoying.

A thick, soupy substance, usually foul in appearance and/or smell.

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.