Definitions from Wiktionary (greenie)

▸ noun:  (chiefly Australia, New Zealand, slang, derogatory) An environmentalist, someone who shows concern for the environment; often aimed at environmental extremists.
▸ noun:  (Australian politics, informal, by extension) A member of the Australian Greens.
▸ noun:  (US, Wyoming, derogatory, slang) A person from Colorado; after the color of the Colorado license plate.
▸ noun:  (informal) An unripe fruit.
▸ noun:  (US, slang) A beginner, a novice; a greenhorn.
▸ noun:  (informal) A small, green object.
▸ noun:  (slang) A blob of nasal mucus; a bogey.
▸ noun:  (US, slang) Amphetamines used in baseball.
▸ noun:  (informal) Any of various birds having predominantly green plumage.
▸ noun:  A green-headed sunbird (Cyanomitra verticalis), of Africa.
▸ noun:  A scaly-breasted lorikeet (Trichoglossus chlorolepidotus), of Australia.
▸ noun:  A white-plumed honeyeater (Ptilotula penicillata), of Australia.
▸ noun:  A western silvereye (Zosterops lateralis chloronotus), of Western Australia.
▸ noun:  (informal) An Atlantic thread herring (Opisthonema oglinum), a herring-like fish in the family Clupeidae.
▸ noun:  (informal) The yellowtail rockfish (Sebastes flavidus), a fish in the family Sebastidae.
▸ noun:  (golf) The player whose ball is closest to the hole on a par-3 hole after the first shot (drive), in the case when multiple players reach the green on that first shot and the player with the closest ball sinks the ball within the next two shots.
▸ noun:  (US, military, slang) A Green Beret.
▸ noun:  (surfing, slang) Short for greenback. [(US) Any bill that is legal tender in the US (originally printed with green and black ink) issued by the Federal Reserve.]

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