Oxsidian 

A type of material that is made out of the animal Ox, and the material Obsidian, the in-game username is used by a guy from Glasgow that plays video games specifically 2 games called Roblox, and Destiny 2.

Ay yo what's good Oxsidian!

Oxsidian by Hiyanopa January 20, 2021

Obsidian 

In the realm of hard rock and heavy metal music, to be Obsidian, a band must straddle the line between rock and metal, while having psychedelic, occult, & doom elements.

Uncle Acid and The Deadbeats, Jex Thoth, and Blood Ceremony have all, at one point, been Obsidian.

Obsidian by Xenos Nassar August 6, 2012

Harder than obsidian 

Your man when he sees Pieck Finger

Her: You’re harder than obsidian!
You: I just watched a Pieck Finger edit, wanna roleplay?

Harder than obsidian by TheProGuyDudeBro April 15, 2021

Black Obsidian 

A code name for a female named after a crystal

Friend: “Did how did your date with black obsidian go.”
Friend 2: “Good!”

Black Obsidian by Brickroadhouse November 23, 2022

Obsidian Order 

A Cardassian secret police and spy agency. Enabran Tain was its longest serving chief; his son Garak was a onetime agent and was kept alive in exile only by its intervention.

The Obsidian Order works among the shadows.

Obsidian Order by Greg October 7, 2004

Obsidianize 

A word used by Minecraft YouTuber "ShadowApples". The act of turning lava in Minecraft into obsidian

I'm going to obsidianize this lava pool

Obsidianize by the1andonlydefinitiongiver1 September 4, 2020

Obsidian 

Black, hard, heavy, unnatural almost-metallic material. Something much similar to hardened lava.

obsidian chalices, other such things. 'Obsidian tides will be natures bane.'

Obsidian by Quilly February 6, 2005