It's a catch phrase dating back to 1887, when, in a blatant case of favoritism, British Prime Minister Robert Cecil (a.k.a. Lord Salisbury) decided to appoint his nephew Arthur Balfour to the prestigious and sensitive post of Chief Secretary for Ireland.

So "Bob's your uncle" is another way of saying "your success is guaranteed."
You just put these parts together like this, and Bob's your uncle - you have a working model!

You want to go to the stadium? Go straight on until you reach the park, take the first left, and Bob’s your uncle - you're there!
by Pro-Love Girl September 10, 2010
there you go/it will be done and sorted
to run a ps2 game you put in in the games console and bob's your uncle
by loz November 27, 2003
You go and ask for the job -- and he remembers your name -- and Bob's your uncle.
by Brian August 26, 2003
Aussie slang term meaning "and there you go", "and then you're done", etc.
To make popsicles, just put juice in an ice tray, put a toothpick in each cell, put it in the freezer overnight, and bob's your uncle.
by korex December 30, 2004
And Means “there it is,” “there you have it,” or “everything is alright.” Commonly use in the UK and through the Commonwealth. Similar to the French “et viola.”
Magician waves his wand over his top and says: “Abracadabra! Alakazam!” As he pulls the rabbit out he says “and Bob’s your uncle!!”
by Kannath May 8, 2018
There you go!
That's it!
Everything is Okey Dokey.
.....it's ready to go...
It wasn't running right, so I cleaned the carb, adjusted the points and Bob's your Uncle!
by Size Queen 7 July 6, 2011