Noun
little black book (plural little black books)
An address book, especially one in which the details of one's lovers are recorded
Advertising company Little Black Book tweeted: "Yep, we've been evacuated again. Source: Internet
Scrolling through the blog Yolanda’s Little Black Book, you might wonder: who is “Yolanda” and how on Earth does she know the ins and outs of celebrity real estate so well? Source: Internet