Top Definition
-Used by smugglers to describe illicit goods in transit, usually military Hardware
-Advanced weaponry that has been acquired illegally for the purpose of arming a militia or insurgent group
"You gotta bring us over some grey stuff from Russia. It's for the National Alliance."

-Codename: 'Chief Mustard'
by Captain B. April 22, 2008
5 Words related to grey stuff

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