noun
Twitter used for foolish or self-incriminating posts
Derogatory/humorous Internet slang for Twitter when people post stupid, embarrassing, or illegal content that gets them into trouble. A pun on バカ (fool) and ツイッター (Twitter).
See also: ツイッター
あの芸能人、またバカッターで炎上してるよ。
That celebrity is getting flamed again on Twitter for posting something stupid.
バイト先の冷蔵庫に入った写真をバカッターに上げてクビになったらしい。
Apparently he got fired after posting a photo of himself inside the workplace fridge on Twitter.