Not just any car not from another country. A Foreign Car is an expensive Car, typically from Europe such as Ferrari, Lamborghini, Maserati, Maybach or Bugatti
As the name already says a foreign or foreign whip is a car made made in a foreign country like Germany or Japan. Nowadays its often used in the rap-scene to refer to a expensive and fancy car, like Lamborghini or Mercedes-Benz.
Dude! Have you seen his new foreign car, its super sick!!
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"