Yes, "beaters". Maybe it's a northern expression?
We called all our old cars "beaters". Growing up, that's all we had in our family! We went from one $500 car to the next -- all from the 1970's. They were huge, gas-guzzling, no A/C, sometimes no heat. They were heavy and made of solid steel. This was back in the 1980's, when gas was under a dollar a gallon.