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1.
n. (or monolyth) - A large piece of faeces. Slang word comes from the word monolith when describing a large structure (like stone-henge).

Generally a monolith is so large that there is significant difficulty in flushing it down the toilet.

A cabre often can be described as a monolith.
"Crikey, check out the monolith in cubicle 3"

"My monolith was riddled with corn"
by Refreshment Boxx April 03, 2010
 
2.
In 2001 a space odyessy the monolith came to earth and helped the apes evolve into senient life forms and then came back later to turn dave into a giant superintelligent baby.
by linzoy August 09, 2003
 
3.
A free standing turd that mysteriously stands erect out of the toilet water.
Dude, I can't believe it. I stood up and there it was, standing out of the water; a monolith.
by Paddy M May 30, 2008
 
4.
a beast ass moving base in warhammer's 40,000 dawn of war. used by the necrons(an alien race) to destroy and dominate every other race in the game.
"hey bob how ya liking the new monolith". "good i can finally shoot my arch-enemy from a mile away".
by Leland Whitworth January 23, 2008