The expression means "and there it is" or "and there you have it." The term is usually used in the UK and other Commonwealth countries. People commonly use it to end a set of simple instructions or when a result is reached. American author, A. J. Langguth and others believe that the expression arose after Conservative Prime Minister Robert "Bob" Cecil appointed his nephew Arthur Balfour as Chief Secretary for Ireland in 1887, an act which was apparently both, surprising and unpopular. Whatever other qualifications Balfour might have had, "Bob's your uncle" was seen as the conclusive one. Despite its origin, the term’s meaning has become announcing, acknowledging, or explaining a result or outcome that is achieved more easily than otherwise imagined.