廃はい垢あか

noun

abandoned account; unused account; old account

Internet slang for a social media or online service account that is no longer actively used, often left dormant for a long time.

• 彼かれのツイッターはもう廃はい垢あかになってるね。

  His Twitter account has become an abandoned account now.

• 廃はい垢あかを整せい理りして、使つかってないアカウントを削さく除じょした。

  I cleaned up my abandoned accounts and deleted the ones I wasn't using.