Concatenation of the French word "savoir" (to know) and "navigation". Used to describe a route/short-cut as yet untraversed, but which you think could ultimately lead to your desired destination.
Passenger: "Wow! Where are you going, dude? This isn't the way to Mothercare.".
Driver: "I know, but I'm hoping my savigation will get us there, avoiding the traffic lights on Ashley Road!".