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