noun
pretending to know more than one does based on superficial knowledge
A yojijukugo describing someone who acts knowledgeable about a book, play, or subject after only learning its title or name. Often used critically.
彼は外題学問で、本のタイトルだけ知っていて内容はまったく知らない。
He is all about superficial knowledge; he only knows the title of the book and nothing about its content.
知ったかぶり is a more common, everyday term for pretending to know something, while 外題学問 is a formal yojijukugo specifically about knowing only the title or name.
外題 (title of a book or play) + 学問 (learning, scholarship). Literally 'title learning', referring to the pretense of scholarship based solely on knowing the title.