Possible Clues:

• 'Oh, before I forget ...,' in a text
• 'Oh, yeah ...,' in a text
• Emailer's 'incidentally'
• 'b4 I 4get...'
• 'What's more ...,' in a text message
• Incidentally, for short
• Incidentally, in texting ... and a hint to three long puzzle answers
• Cousin of FYI
• Incidentally, in a txt msg
• ''Incidentally'' in a chat room