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1.
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.
-Dude it's Thursday what shirt should I wear?
-Dude a green shirt. It's Green Shirt Thursday.
-Oh yeah. Thanks man.
by shark November 11, 2004
 
2.
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.
Young and restless man participates in Green Shirt Thursday ... Adventurous and exotic women flock to him that weekend
by BAAJ March 07, 2006