A memoir is a type of book that tells the story of someone's life. An egotist is someone who is overly proud of themselves and thinks a lot about their own importance. Memoirs of an egotist is a book about someone's life that focuses on their accomplishments and how great they are. It will talk about their successes and how they have made a difference in the world. Memoirs of an egotist is a way for someone to show off all of the amazing things they have done, and to express their pride in those accomplishments.