FYI relative

• Texter's 'incidentally'
• "Oh, another thing ...," in a text message
• "b4 I 4get..."
• "Before I forget," for short
• Texter's "Oh, before I forget ... "
• Emailer's 'incidentally'
• "While I have you ...," in a text
• "Oh, forgot 2 mention ..."
• "Incidentally" in chat rooms: Abbr

Wiktionary Word definitions in Wiktionary
abbr. (alternative spelling of BTW English)