A high school friend of mine, Jewish, called those cars Jew Canoes. That was back in the pre-PC days when you could make ethic jokes good-naturedly without offending anyone.
Still the name, at least amongst my thicker-skinned brethren.
Correction: not Mercuries, but Cadillacs.
The origin of this goes back to Henry Ford being such as nasty Hitler supporter and the resulting refusal of Jewish people to drive a Ford product as a result.
My in-laws would still pick a German car over a Ford product (and now drive Land Rovers and Jags).