"Switch Bitch" is a title of a book by Roald Dahl, which is a collection of four short stories. The term "switch bitch" is a play on words that has a vulgar connotation, and it generally refers to a woman who is promiscuous and willing to engage in sexual activity with multiple partners. However, it's important to note that using this term to describe someone is considered disrespectful and offensive, and it's not an appropriate way to refer to anyone.