Possible Clues:

• 9-to-5er's cry of relief
• Cry at the end of the week
• 'Weekend, here I come!'
• 'So ready for the weekend!'
• "Yay, the weekend!" letters
• End-of-workweek initials
• 9-to-5er's shout
• ''Finally, the weekend!''
• End-of-week shout
• Weekly shout for some