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Any day of the week, besides Friday, that is the last day of your work week due to scheduling, vacations, days off etc.
William: Dude, why are you wearing jeans to work today today, it isn't casual Friday, it's Wednesday.
Jack: Nah, it's logical Friday, I am outta here Thursday and Friday this week. TGILF!!
by Jake of Clubs June 05, 2010