Black Friday (shopping) - Wikipedia, the free encyclopedia: "JANUARY 1966 -- 'Black Friday' is the name which the Philadelphia Police Department has given to the Friday following Thanksgiving Day. It is not a term of endearment to them. 'Black Friday' officially opens the Christmas shopping season in center city, and it usually brings massive traffic jams and over-crowded sidewalks as the downtown stores are mobbed from opening to closing.[12"