Top Definition
Thursday of each week is a designated shirt day, hence, Shirt-Thursday.
Shirt-Thursday was founded and spread throughout the western world by Robert "carth" Spencer-Green in comemoration of the royal horse artillary during the war.
"What are you doing on thursday?"

"IT'S SHIRT-THURSDAY!!! I AM WEARING A SHIRT!!!"
by Denny Loi December 01, 2005

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