"As an aside," in chat lingo

• "Oh yeah ...," in a text message
• "Incidentally" in a chat room
• E-mail aside letters
• "just 1 more thing . . ."
• "I forgot to mention," online
• Digression lead-in, in texts
• "Oh, I forgot to mention," in a text
• "Incidentally ...," to a texter
• FYI cousin

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