Related Clues:

• Winner at tic-tac-toe
• Winning tic-tac-toe line, when player X isn't paying attention
• Abbreviation in an away-from-work message
• _ut _f _ffice, in an automated email
• Off from work, in emails
• Hugs, in texts
• Not at work, for short
• Letters meaning "I'm on vacation"
• "I'm on vacay" notification