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1.
A male that get's an unknown std, or a combination of STD's.
That bitch gave me green dick
by RKTrueluck August 07, 2004
 
2.
Someone who's from the country, a rural. These people are called "green dick" because they like to sow crops before they get busy.
"Oi, Green Dick, come here you country fucker!"
by PatrickA July 19, 2006