An idiomatic expression in American English for something which is not only a very bad idea, but quite obviously a very bad idea.
To those not blessed enough to be living in the United States - the gas station used to be a place where a friendly porter dressed like a bellhop would saunter over, and use expressions like "Golly gee willickers, Mister Wilson" while filling your car, checking your tires, oil, and windshield washer fluid levels and washing your windows.
Then customer service was deemed too expensive to continue with except in Oregon and New Jersey (where it is illegal to pump your own gas) and now people are required to pump their own gas. After gas started to get so expensive that people decided it was just better off financially to drive away with $100 in gas rather than pay for it, gas stations insisted on pre-payment.
Unless you're in truly backwoods America, the gas station interior will be a full-on convenience store. In larger ones such as…