Bad-ass, bee's knees, and bomb-diffity - slang rules Teachers, politicians, broadcasters, and parents complain of the slang-infested language of today's teenagers. But slang has been around for centuries, always troubling those who take a purist line on the English language. In this entertaining book, Julie Coleman traces the development of slang across the English-speaking world and explores why and how it flourishes. She makes use of a marvellous array of sources, including newly available online records of the Old Bailey, machine-searchable historical newspaper collections, slang users themselves, scholarly works, and the latest tweets. It is a book guaranteed to teach you some new words that you shold never use in polite company.