An enormous being the size of a subway train, created to build the giant cities of the Old Ones. Just seeing it is a mind-blowing thing. The name means "Inhabitant of the kingdom of darkness."
Currentaly living in vast lightless caverns and tunnnels under Antartica.
It was a terrible, indescribable thing vaster than any subway train - a shapeless congeries of protoplasmic bubbles, faintly self-luminous, and with myriads of temporary eyes forming and un-forming as pustules of greenish light all over the tunnel-filling front that bore down upon us, crushing the frantic penguins and slithering over the glistening floor that it and its kind had swept so evilly free of all litter... "At The Mountains of Madness" by H. P. Lovecraft
by Auric the Rad November 4, 2003
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Any impressively large and overweight goth; often glimpsed spilling out of an ill-fitting corset or waistcoat in the corner of dingy nightclubs. From the amorphous, roiling Cthulhu Mythos monster of the same name.
"Christ, I was hammered last night; woke up with {NAME} taking up most of the bed"

"Blood hell, you shagged that shoggoth! Did you lose d10 sanity for seeing them naked? If you carry on like that, you'll have to wear an Elder sign on your crotch."

(pause) "You fucking geek!"
by Mu Cow May 15, 2007
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Amoeboid-shaped extra-planar demon one can summon for grotesque sexual gratification. Inspiration for many, many manga flicks, though the entity certainly should not be confused with a titillating cartoon character, however horrific.
Ex: "Umm, you need an Elder Sign to summon a shoggoth, but even with one, you will probably be killed before you can mold a protoplasmic pussy. Better stick with your sister, she doesn't know any better after the accident anyway," confided Cletus.
by Anonymous February 25, 2003
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