MSG stands for Marine Security Guard, the world's best trained and most disciplined guard force of United States Marines, In every clime and place.
The MSG stood his post at the embassy.
by David T August 16, 2005
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The root of many food intolerances
by chunky beef October 3, 2003
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'My Summer Guy' - from the retarded show "Royal Pains"
you're an msg. I know it doesn't make sense, but that's the way they say it on the show.
by RoyalPains Sucks July 29, 2009
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Local Long Island gang.MSG stands for
Mob Squad Gangstas.Gang was known to be started in the William Floyd School district then spread throughout the streets of Ny
Fighting , stealing ,and just holding shit down
by G March 10, 2005
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Machine-Shot-Gun
Combining the spray of a shotgun with the automatic firing capability of a machine gun.

This MSG would kill the Matrix.
by UrbanEdd October 12, 2008
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I burrowed a cougar hat with OBEY in big letters from my MSG friend.
by Landmeister February 24, 2017
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1. mexican slut guy
2. the highest level of slutting that you can only hope to achieve
me: i just passed my MSG test
you: WHOA
me: yeah, be jealous
by bhananan May 10, 2005
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