Letters before an emailed aside

• "What's more ...," in a text message
• Lead-in to a texter's afterthought
• Chatroom digression shorthand
• "And another thing ...," in texts
• "Incidentally ...," in texts
• "While I have you ...," in a text
• "Before I forget" letters
• "just 1 more thing . . ."
• "Incidentally..." in a text

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
Internet abbreviation of by the way , in use by 1989.