The phrase comes from H. P. Lovecraft's 1928 story The Call of Cthulhu, where cultists chant in the fictional language of the Old Ones. It is usually translated as in his house at R'lyeh dead Cthulhu waits dreaming, referring to the sunken city where the entity sleeps. The chant became a cornerstone of the Cthulhu Mythos and spread through horror fiction, tabletop games, video games, and metal music. Online, the recording is shared as a shorthand for awakening something ancient and unstoppable.