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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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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To have or having a gaint pp. Others names for it are moster pp,giant pp
TAE AND CHLOE HAVE MAGNUM DONGSSS
by Magnumdongsforlife June 28, 2019
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A phrase referring to the massive cock attached to my waist
Wow my Magnum Dong feels happy today
by godpleasehelpme October 10, 2020
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Name of the third LP by German rock band El Andaluz. Named after the famous Danny DeVito-meme.
Hey, have you listened to Magnum Dong by El Andaluz?
by MarLauLo May 11, 2020
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When you slap two or three xl magnum condoms on your penis then proceed to have rough sex with another man
My boyfriend magnum donged me last night.
by Plump wang69 January 4, 2020
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