Possible Clues:

• 'Incidentally,' in a text
• "Incidentally," to texters
• FYI relative
• "Incidentally," in a text
• Texter's "Incidentally"
• Texter's segue
• “Incidentally,” online
• "Incidentally," in texts
• Texter's afterthought lead-in
• Incidentally, in text messages