I find that phrase (it's two words, not one) quite clear: it means a vehicle that is capable of driving from start to destination, as determined by the human sitting in it, without any human input other then specifying the destination.
That is what it means to me. What word(s) do you use to describe a vehicle with that capability?
Google is operating cars that are capable of "full autonomy" right now, so it is not a theoretical concept.
Just to split hairs, wouldn't it actually mean that the car decides where it wants to go?