Possible Clues:

• "Beats me," in texts
• Shrug, in a text
• 'Beats me,' in texts
• "u tell me"
• Texter's "No clue"
• Texter's "Beats me"
• Texter's "No idea"
• Texting shrug
• '___, my BFF Jill?'
• Texter's 'Beats me'