"Just thought of something," initally

• "Oh, and did I mention ...," in netspeak
• "just 1 more thing . . ."
• "Oh, P.S."
• "One more thing..." online
• Texter's "Also ..."
• Texter's "Oh, and another thing ... "
• Texter's segue
• Texter's 'incidentally'
• "While I have you ...," in a text

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