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Short for "Greenside Operations", is a term used to describe special operations carried out by the US Marine Corps in which direct contact with opposing forces is not intended. These type of missions are usually carried out by Force Reconnaissance, an elite special-purpose unit of the USMC.
Get some light armor and don't take too much ammo; the mission's greenside.
by James029302 November 17, 2007

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The greenside is the place you go while under the influence of mary jane

slang for smoking weed
"yo i got a nice joint rolled and i'm going to the greenside later tonight"

"you drinkin tonight or going to the greenside?"
by SmokeySoUth April 22, 2008

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