owedometer
Da gauge on your dashboard dat progressively shows how much you're gonna be "in da hole" for da gas to refill your tank as it gets emptier and emptier.
I have an "impulse buy" problem, so I sure wish dat SHOPPING CARTS had an "owedometer" on their wheels to warn me how about much my total bill is running up as I trundle said trolley around da department store or supermarket!