A car that looks like something your grandmother drove, assuming similar tastes among all grandmothers. Sedan with a front hood so long it seemed that she couldn't see over the end of it. Seats with many degrees of electronic tilt controls. American-made, often Oldsmobile or Cadillac or Buick.
I didn't go to a fancy high school. The parking lot was full of gramsmobiles--old cars from our families that still ran but other than that, not much good could be said about them.