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

obsidiot 

Those who are amongst the ranks of Fallout fans who believe New Vegas is the be all-end all of the series, and will venomously, and maniacally defend their stance with the ferocity of Chricj Crocker defending Britney Spears while screaming into a webcam. These neckbeard adorned cock goblins are also known for screaming "drones " before launching into a badly spelled rant that you have to struggle up understand.

Matt: Holy shit, Tony's such an obsidiot.
Kevin: That emo kid needs to wash his hair.

obsidiot by SoulSurvivor23 September 23, 2017

Obsidine

A thing Danny said in Stampy Seed Survival Episode 18

Wow Obsidine makes Danny use dan_turnedon

Obsidine by KazUwU March 19, 2020

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

obsurd 

The way stupid people spell absurd.

AIM- "Hey Derek my grade on that spelling test was obsurd! i totally studied that shit."

"Wow Bryson, Its spelled absurd. maybe theres a reason you failed the spelling test.."

obsurd by Alyssa Weber May 22, 2008

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

Obsidious

obsidious adjective. rare. from Latin obsidium siege, from obsidere: see OBSESS, -IOUS. Besieging; besetting, siege like, besiege, unrelenting, attempt to overpower, an extensive period of misery.

With his relentless obsidious nature, he would not let up until he conquered all before him.

The misery he endured was truly obsidious.

Obsidious by Obsidious August 2, 2009