Ｆ外失えふがいしつ

expression

apologies for tweeting at someone you don't follow and who doesn't follow you

Slang abbreviation used on Twitter when initiating a conversation with someone outside one's mutual follow circle. The full phrase is ＦＦ外から失礼します.

• Ｆ外がい失しつですが、先さきほどのツイートについて質しつ問もんがあります。

  Sorry for tweeting at you out of the blue, but I have a question about your earlier tweet.