Possible Clues:

• "Beats me," in texts
• 'Beats me,' in texts
• Texter's "No idea"
• Texter's "Beats me"
• Texting shrug
• '___, my BFF Jill?'
• Texter's 'Beats me'
• Texter’s “Beats me”
• 'No clue,' for short
• "No clue," for short