an amazing rapper that is a division of NDIA and uses hard hitting lyrics to get his thoughts through
Yo dat magnum song wuz da shyt niga...
by The Dude May 5, 2005
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A comically large shlong, capable of filling an over sized condom with disturbing ease.
As a pickup line:

<drops magnum condom in front of hot, yet sufficiently easy woman>

"Oh whoops… I dropped my monster condom that I use for my magnum dong."

As demonstrated by Frank Danny DeVito in "It's Always Sunny in Philadelphia".
by Rationalize October 10, 2011
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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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Magnum Dong is a phrase said by Danny DeVito. He requires a Monster Condom for his Magnum Dong.
I dropped my Monster Condom for my Magnum Dong.
by Bruuh Moment August 2, 2019
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The most ass-kickingest cartridge in the world!
guy 1: That guy totality fucked that elk up!!
guy 2: What did he use?
guy 1: a 7mm Magnum!! duh!!
guy 2: Oh yeah.. i must be stooopeeed!!
by alphadarklite June 6, 2010
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