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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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Jul 26 Word of the Day
Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term β€œsecond string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A β€œSecond String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed
I got a call from X the other night. She had an extra ticket to a concert she bought for a friend, but they couldn’t make it so she called me to ask if I wanted to go because I am her Second String Friend.
by Deus-ex-machina August 26, 2020
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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.
via giphy
by RobyRoby August 07, 2018
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