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1. Douchebag, male, usually from Wisconsin.

2. Moldy scrotum that results from your girlfriend putting her hand in a bag of shredded parmesan before stroking you mercilessly. (Cheese may or may not be from Wisconsin.)
Don't invite that Greenbag to our superbowl party!

I told him to go wash his Greenbag before he came back to bed.
by SMBH October 10, 2007
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Smoking a huge joint and then donating blood afterwords, causing the person who received the donated blood to feel the affects of marijuana.
Hey Jerald there's gonna be a blood donation session at the community center, we should totally green bag it.
by HoraceOrchestra April 12, 2014
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