I don't know what it is, but I don't like bumperstickers anyway. They are rarely funny after the first laugh, and anyway most of the time they are sanctimonious bits of crap. Or worse, they are taped on. People who tape bumperstickers to their bumper with tape ought to have their car taken away from them for two weeks.
But I am willing to give them the benefit of the doubt that the above referenced vehicle was purchased secondhand. At least it wasn't a Prius.