Aside from its conventional meaning (look it up) can be used as a substitute for 'cool' or 'worthy' in the company of fringe metalheads and acolytes of the Necrowizard.
Amon Amarth are chthonic as fuck.
by Lord Grimcock January 14, 2008
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A black metal/folk metal band from Taiwan, they have been around since 1995, and have made 5 studio albums, and are scheduling their newest album for june of 2011. Their lyrics focus mainly on the subjects of Chinese mythology, Taoism, and political stuff.
Their band name is pronounced Thonic, not Kthonic, Chuhthonic, or anything else.
Metalhead1: "hey, have you heard of that black metal band from china? I forgot their name, but they're pretty good"

Metalhead2:"yea, dude you must be talking about Chthonic! you have good taste :P"
by CYRZ May 11, 2011
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(Greek):
1.pertaining to the underworld 2.dwelling underground 3.rising up (out of the ground)(B.M.)
Orpheus, a musician who went to Hades (the subterranean land of the dead in Greek myth) to ask for his lover's return to the world of the living, played music for his chthonic audience so beautifully that they relented to his request and let him try to take her back up to the surface.
by j. rabbit richards March 23, 2005
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A word invented by Nazis for children suffering from dyslexia
What is the difference between Hitler and Cerberus? One is a chthonic monster that lives in the underworld and the other is a three-headed dog.
by hoebot 3000 November 28, 2018
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