Slang abbreviation of 'account suspension' (アカウント停止); used online to refer to a user account that has been suspended.
あの配信者、規約違反でアカ停になったらしいよ。
I heard that streamer got their account suspended for violating the rules.
誤タップで違反行為が投稿され、すぐにアカ停になった。
A mistaken tap posted a violating message, and the account was suspended immediately.
アカ停になるとログインできなくなるから注意して。
Be careful because if your account is suspended you won't be able to log in.