Possible Clues:

• End-of-the-week letters
• Pre-weekend yell
• Worker's end-of-week shout
• Employee's end-of-week shout
• 'What a long week!'
• End-of-workweek shout
• Weary worker's sigh
• "Bring on the weekend!"
• "Yay, the weekend!"
• Weekly cry of relief