外げ題だい学がく問もん

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Meanings

1

pretending to know more than one does based on superficial knowledge

yojijukugo (four-character idiom)

A yojijukugo describing someone who acts knowledgeable about a book, play, or subject after only learning its title or name. Often used critically.

彼かれは外げ題だい学がく問もんで、本ほんのタイトルだけ知しっていて内ない容ようはまったく知しらない。
He is all about superficial knowledge; he only knows the title of the book and nothing about its content.