Etymology: AmE Philly ("Philadelphia") + BrE Philistine ("uncultured swine").
A visitor to Philadelphia who utterly overlooks amazing historical or cultural landmarks while actively seeking out stupid ephemera and tourist traps.
Edgar: "Hey, look at the crowd lined up for photographs with that shoddy Rocky statue."
Walt: "You suppose any of them knows that there's a world-class museum at the top of those steps?"
Edgar: "...Fucking philliestines."