Part of a phrase in HP Lovecraft's Cthulhu mythos. Translates roughly to, "dreams," "sleeps," or "waits."

The phrase - Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn - translates to, "In his house at R'lyeh, dead Cthulhu waits dreaming."

It is often shortened to, "Cthulhu fhtagn," which loosely translates to, "Cthulhu waits," or "Cthulhu dreams."

The Great Old One, or High preist of the Great Old Ones depending on the story you read.
Less a god than a monstrous horror resembling an octopus, man, and dragon cojoined from a creation wholy unlike birth.
Best pronounced sucking water into your lungs whilst beining dragged down by a tentical.
Anyone shewn Cthulhu, sometimes even in representations fearfully crafted by his cults, cannot survive sane.

The home of Cthulhu, the Great Old One who invades our dreams. Last reported on the ocean floor 47°9?S, 126°43?W, halfway between Australia, and Antarctica.