I hear you ask "how can a memoir be metaphorical?." Well, the book actually explores this idea. If a work has fiction in it then it can't be autobiographical or vice versa. However, this is not always true. There are many types of life narratives (not autobiographies) and this is an interesting one.
From the title and the beginning, we understand that all the things in the book might be a lie after all. Well, they might be true as well, or some of them are true. We don't really get an answer so don't expect to find out if she is telling the truth or not.
Slater claims that she has a mental illness and this causes her to mix reality and fiction. How do we know for sure that she has an illness? We don't. However, the way she talks about it makes you believe her. She reminded me of the trickster type. You know that trickster lie but you believe them anyways because they make it believable.
In general, I liked the book. However, towards the end of the book, the lying thing started to become annoying and then finally the book ended. It was good overall because it was very different than other memoirs and life narratives. Very original and postmodern but not extremely good.