On Thursday you wear a green shirt. Every Thursday. If you forget don't worry there is another Thursday only a week away. Remeber wear a green shirt every Thursday. Anyone can do it.

Literally everyone, ever. Including the writer of this definition.

Wear a green shirt on Thursdays if you are a lonely single looking to score some action for the upcoming weekend. The green shirt will signal to those interested what your intent for that weekend is, and possibly help you hook up with a lovely individual.