From Wikipedia: "Bob's your uncle" is a phrase commonly used in the United Kingdom and Commonwealth countries that means "and there it is" or "and there you have it" or "It's done". Typically, someone says it to conclude a set of simple instructions or when a result is reached. The meaning is similar to that of the French expression "et voilà!" or the American "easy as pie" or "piece of cake". Ha. As a native American English speaker, I didn't know that one!