green market

Surreptitious trade in agricultural produce: buying and selling of agricultural produce that is against the law or official regulations. A common practice within the EU particularly since the rise in popularity of internet based auction sites.

"Hans, how on earth do you think Herr Muffin is going to shift all that reject grade wheat?"

"He'll probably flog it on the green market Gunther, he usually does"

green market by stropmag November 3, 2006

Green marker 

1) A marker that is green.
2) To hide drugs (usually weed) in a fat Crayola marker. Usually done by students, especially in elementary school, middle school and high school because markers are fairly uncommon at schools and no one ever really pays attention to them.

1) "Dude, can I borrow your green marker?"
"Sure."
2) "Dude, can I borrow your green marker?"
"No, it's not a marker anymore."

Green marker by Minnesotasucks March 27, 2010