A term used to end a set of instructions to indicate the ease of the instructions themselves; very similar to the French use of "et voilà!".

"take a left, then a right, then straight forward and Bob's your uncle – you're at the location."

One explanation for the origin of the term is that it is related to the British General, Lord Roberts, nicknamed "Bobs". The British Army in India coined the term "Bob's your uncle" to indicate you had the good fortune of being related to the commanding general.