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1.
A novice; a person who is not sharp; someone who is inexperienced. Automotive trade word.
That guy lost the car sale; what is he a green pea?
by Mosiah May 26, 2005
 
2.
1. A member of the Environmental Group "Green Peace".

2. A general term used to describe a environmental activist.
Katelyn is green pea... always trying to save baby seals...
by m-db December 22, 2007