Top definition
A person's metaphoric wang, the size of which being related to his apparent devotion to the environment via principles, purchases, lame t-shirts and bumper stickers, etc. "Green" comes from the color commonly associated with environmentalism, and "peen" is short for penis. Duh.
While Ryan greatly enlarged his greenpeen by purchasing a Prius, Sean's Highlander Hybrid provided a decent enlargement while also allowing him to keep his dignity.
by Guruboy July 21, 2008
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