(pronounced like the first syllable in 'open') A massive joint, spliff, doobie, blunt, or other, preferably rolled as cone, containing some combination of weed/hash and opium.
"Yo dog, roll up a fat op cannon"
A: "Damn yo, I'm fuckin faded, whats in this?"
B: "Damn straight yo, you're puffin on an op cannon"
A: "wooorrrddd..."
A: "Damn yo, I'm fuckin faded, whats in this?"
B: "Damn straight yo, you're puffin on an op cannon"
A: "wooorrrddd..."
by pumpkineater February 24, 2014

by Dr Killshot October 6, 2011

The opposite of Big Facts, when someone says something that is not at all relatable but you give them credit because it’s 2018
by Chettywap January 18, 2018

Nonoperative (LGBT, of a transgender or transsexual person) Having chosen not to undergo sex reassignment surgery.
by Happy tree times May 30, 2023

by opTaco May 4, 2017

If you announce something is op fire then it is then telling everyone you or something is overpowered and that it is figuartively on fire as an expression, you also have a state of god mode .
by JacobKenobi March 9, 2021

by ajala ajala mama e October 31, 2019
