Shout at the end of a workweek

• Shouted end-of-the-week letters
• Comment by the work-weary
• Chant in a 2011 Katy Perry single
• Expression of relief
• Fri. refrain?
• "Hooray for the weekend!"
• End-of-the-work-week cry, briefly
• Inits. one might hear at the office
• "Phew, what a long week!"

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
also T.G.I.F. , by 1946, slang abbreviation of "Thank God (or "goodness"), it's Friday" (end of the work week).