Rock opera 

A music album that tells a story essentially. A rock opera will have many tracks on it, but they will all follow a storyline. Rock operas arent really "opera" music, but are generally rock. Just about anyone can like them, and the music is generally superb.

The first rock opera ever was Tommy, by The Who. Another great rock opera is The Wall, by Pink FLoyd.

Rock opera by brian May 4, 2005

oppty 

Short version of opportunity, used by your corporate boss.

Wrt our sales figures, Fall will bring additional oppty to grep some clients.

oppty by Tanaka Mushi August 6, 2010

Oppaitology 

A cultured religion that worships oppai (boobs), especially anime boobs and the relevant physics involved. A rival religion of the adonitology faith.

"Worshipping curvy butts is good and all, but oppaitology is better!" ~ some hentai connoisseur and oppai worshipper (that's what he called himself)

Oppaitology by Phantom2682 October 25, 2020

Oppa 

Something you should NEVER call Jungkook

You: JUNGKOOK OPPA💜
Kookie: I AM NOT YOUR OPPA 😡

Oppa by Suga Kookie Monster March 10, 2019

opfor 

Military term for Opposing Force during a combat simulations and war game scenarios.

EX: The opfor is approximately 300 meters from your position. Take care.

opfor by The Omega Necro December 15, 2007

Operation Northwoods

Operation Northwoods was a 1962 plan by the US Department of Defense to cause acts of simulated or real terrorism and violence on US soil or against US interests, blamed on Cuba, in order to generate U.S. public support for military action against the Cuban government of Fidel Castro.

Operation Northwoods makes me lol.

Operation Northwoods by skakid9090 October 2, 2007

opsat 

Communication device used by Sam Fisher of the Splinter Cell book/video games that resembles a PDA and is used to communicate to the support team in the NSA via wireless network

Sam details on your opsat

opsat by Sam Fisher L337 September 7, 2007