greenie

noun

1. (chiefly Australia, New Zealand, slang, often derogatory) An environmentalist; someone who shows concern for the environment.

2. (Australia, by extension) A member of the Green Party.

3. (US, Wyoming, derogatory, slang) A person from Colorado; after the color of the Colorado license plate.

4. (US, slang) A beginner, a novice.

5. (US, slang) A tablet of amphetamine.