Bob’s your uncle is a commonly-used expression known mainly in Britain, Ireland and Commonwealth countries. It is often used immediately following a set of simple instructions and carries roughly the same meaning as the phrase “and there you have it”; for example, “Simply put a piece of ham between two slices of bread, and Bob’s your uncle.”
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I’ve also heard on one British TV show, somebody put a spin on that phrase… “and Robert’s your Father’s Brother”. I think it was an episode of Foyle’s War to be exact.