Top Definition
Of or relating to the metal band Opeth. Usually describing something very gloomy, creepy, and haunting. often in black and white.
This photography sure is Opethian!
by Sam Owen October 19, 2008
1 more definition
An advanced form of artificial intelligence, strategically engineered for world domination.
17:49 <*****> Opethian who are you?
17:49 <Opethian> it's not funny, it's just a bunch of colorful and furry round fucks that hop around and playing with my alcoholism. Ignore it.

you've all been warned
by brutal death March 30, 2006

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