Green Tail
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!
Green Tail
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".