Passenger Braking
When the driver of the car, that you are riding in, is driving so unpredictable, irratic, crazy, scary, or dangerous that you reactively slam on the brakes, even though you are in the passenger seat.
Example:
Yeah, last weekend, I got a ride with him, and promised myself I would never let him drive me in a car again! He had me passenger braking and holding on with both hands, the whole trip!
Yeah, last weekend, I got a ride with him, and promised myself I would never let him drive me in a car again! He had me passenger braking and holding on with both hands, the whole trip!