Bob’s your uncle is an idiom 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!’
The origins are uncertain, but a common hypothesis is that the expression arose after Conservative Prime Minister Robert Gascoyne-Cecil, 3rd Marquess of Salisbury (Bob), appointed his nephew Arthur Balfour as Chief Secretary for Ireland in 1887, an act of nepotism, which was apparently both surprising and unpopular. Whatever other qualifications Balfour might have had, ‘Bob’s your uncle’ was seen as the conclusive one.
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The Daily Omnivore 