"1) the [black people] at the stop light in the impala with 20" [blades] were bumping so loud it was shaking my car
1) to play music in your car with subwoofers loud enough to were other cars around you can hear the bass coming from them
""1) the [black people] at the stop light in the impala with 20" [blades] were bumping so loud it was shaking my car" What is the definition of "bumping"?