(n.) A GPS (Global Positioning Satellite) devise,
usually mounted on car's inside windshield to assist driver with directions to his desired destination.
1) My girlfriend used to get lost all the time until I bought her a wherethefuckarewe for her birthday.
2) Sitting in back of Frank's car, I asked about a robotic sounding voice mumbling, "turn left at next intersection".
Frank pointed to a little screen attached to his windshield and proudly proclaimed, "that's my new wherethefuckarewe".