What on earth does "who's your uncle" mean, I think I heard "there you go", but how does that work? Mike

"Bob's your uncle" used to be a common enough term to indicate that a task is easily accomplished so are you looking at a variation of that? I have no idea of the origins of the Bob one though.
Example of usage - wrap the guitar string round the peg a couple of times, thread the end through, and Bob's your uncle.