ミリしら

noun

being clueless about a work but still having strong opinions

Internet slang abbreviation of 「1ミリも知らない」 (don't know even 1 millimeter). Used for someone who knows almost nothing about a game, anime, etc., yet confidently superimposes their own views or judgments.

• あの人ひとはミリしらなのに、いつも偉えらそうに語かたるよね。

  That person is totally clueless about it, but always talks like an expert.

• ミリしらの状じょう態たいでアニメの感かん想そうを言いうのはやめてほしい。

  I wish you'd stop giving your opinions on the anime when you know nothing about it.