Similar feeling to being assraped. To be forced to pay exhorbitant amounts of cash to be able to put gas in your car. Especially bad if you have to drive far to work in order to support your family or if you want to see relatives that live in another city/state/province, etc.
Dude #1: Hey, wanna go to the mall tonight?
Dude #2: No, I don't have any cash. I just got gasraped filling up my car so I can go to work tomorrow.
Kids: Daddy, daddy, lets go see grandma!!
Dad: No kids, we can't. See lives 100 miles away & I don't feel like getting gasraped at the pump.