Definition of "greenie"
1. An environmentalist; someone who shows concern for the environment. (noun) Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
2. A member of the Green Party. (noun) Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
3. A person from Colorado; after the color of the Colorado license plate. (noun) Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
4. A beginner, a novice. (noun) Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
5. A tablet of amphetamine. (noun) Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License