Possible Clues:

• Texter's "I almost forgot"
• "Incidentally," to a texter
• Incidentally, in shorthand
• Incidentally, in textspeak
• Bit of texting shorthand
• Texter's 'Oh, yeah ...'
• Cousin of FWIW
• Texter's 'Oh, before I forget ... '
• Texter's "Oh, I should also mention ... "
• Texter's afterthought intro