1. To ride a bike at a medium to high speed, then jump off, allowing the bike to ride in a straight line, and then for it to curve sharply as if a ghost was steering it.
2. To set an automatic vehicle on cruise control, then exit the driver seat and walk in front of, next to, hang on to, etc., the moving vehicle.
1. Timmy and his friends were hanging out, then the dumbass decided to ghost ride his bike, which hit a police car. Timmy is now in jail.
2. Bob attempted ghost riding with his car, but oncoming traffic had other ideas.