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.
by Johnny Tentacles July 28, 2009
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Person 1: I will beat you with my Excalibur!
Person 2: Your penis is no match for my Magnum Opus!
by Soul_kai March 07, 2020
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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.
by RobyRoby August 07, 2018
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