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When you blow weed smoke into a person's asshole, and they fart the smoke out.
Dude, Kelsey just blew the biggest green tail I've ever seen!
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by DaddyKinkojou January 30, 2017
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Green Tail refers to an individual who has a mermaid-like appearance, such as some green strands of hair , usually in the summer, or an unusual fishy fragrance surrounding them.
"Hmmm what is that fish like smell? Ah-hah, that girl there, must be a Green Tail".
by A-Hizzle March 28, 2011
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