A test of objective internet authenticity where the person being sequestered is asked to take a photo of him or herself wearing a green shirt with/in front of/near the object in question.
Originated from the Mugen parts topic of the worlds largest Honda enthusiast forum, this was first used to prove the authenticity of a Honda del Sol Mugen front bumper cover.
Memphis: Hey I own a jet ski!
Vega: Prove it!
Memphis: How?
Vega: By taking the green long sleeve shirt test!
Memphis: What's that?
Vega: Take a picture of yourself while you are eating a jelly dough-nut next to your jet ski pointing at it while you hold a calendar with my birth-date circled, and you must be wearing a green long sleeve shirt...
As is a reference to having sex on a lawn and the resulting green grass-stained clothing, greensleeves may also be used in a broader context to generally mean having sex in public.
The risk of being watched while going greensleeves during a music festival could be a Porn theme/fantasy.
1) An unknown restaurant thats looks cozy, inviting and reasonable but, once inspected, turns out to be pretentious and over priced.
2) A place of business that appears one way on the outside, but has a completely different, usually worse, character on the inside.
1) We went to check out this new place, but it turned out to be a Joe Greensleeves, so we just went somewhere else.
2) The outside looked really cool, but inside was likeJoe Greensleeves.