when a person assaults another person by means of several rocks/gravel in hand, while in a fleeing vehicle.
Rock drive-by - Girl gets pissed off by someone she's dating. While he's standing outside the local club, she picks up a handful of rocks/gravel and ask her friend to pull up beside him in the car. At that point and time, she unloads the handful of rocks on the victim and they drive off. Terrible, right? hahahaha!