Magnum Oopus 

A person's biggest screwup.

Knocking down all the shelving in the parts department was my Magnum Oopus. What a mess.

Magnum Oopus by Hmd107 December 21, 2020

Magnum Opus 

The Latin meaning for "Great Work". Usually meaning the greatest, most popular, pinnacle, or most renowned achievement of an artist, artist or composer. Or a "masterpiece"

Songs for the Deaf is Queens of the Stone Age's magnum opus.

The Dark Knight is Christopher Nolan's magnum opus.

Magnum Opus by Johnny Tentacles July 28, 2009

Magnum_Opus_Bricks 

Haha funny man that loves LEGO star wars

Who’s the haha funny man in the LEGO community?

It’s Magnum_opus_bricks

Magnum_Opus_Bricks by C4_ve August 20, 2021

Magnum Opus 

1. A great work or achievement.

2. An inanimate object in Tower of Cone Mesh Climbing (Juke's Towers of Hell, Roblox) that falls down when you try to get on it, activating an object below. (also called, MY NEXT MAGNUM OPUS) Also, when jumping to it, it makes a loud "metal falling" sound.

Definition 1
Person 1: yo bro look at this magnum opus
Person 2: thats cool man

Definition 2
inanimate object: MY NEXT MAGNUM OPUS
player: *jumps to it*
inanimate object: *falls*

Magnum Opus by MyNextMagnumOpus November 14, 2022

Magnum Opus 

A penis over 8 inches tall

Person 1: I will beat you with my Excalibur!
Person 2: Your penis is no match for my Magnum Opus!

Magnum Opus by Soul_kai March 7, 2020

Magnum Opus Moment

An Extremely Good/Grand idea
A Great Magnum Opus

Ex 1: I had a huge magnum opus moment yesterday.
Ex 2: The song it’s raining tacos is a real Magnum opus moment

Magnum Opus Moment by Cronchy Craker October 15, 2019

Magnum Opus 

The Magnum Opus is the highest working in Spiritual Satanism, and the end result of all legitimate occult disciplines, the allegories and the legends of the Gods.

The Magnum Opus is physical and spiritual perfection and immortality.

You are going to do Magnum Opus.

Magnum Opus by RobyRoby August 7, 2018