Volume Chumping 

The act performed by a caucasian who is driving while loudly listening to a tight hip-hop jam, but suddenly approaches a stop sign or red light. If the driver notices a black person within close proximity, he/she will attempt to subtly turn down the volume. This volume adjustment is done to avoid the uncomfortable feeling of the black person noticing that the driver is just another cracker trying to be down, but failing miserably.

Once James pulled up to an intersection and saw the potential for his cover to be blown, he started volume chumping to minimize his exposure.

Volume Chumping by Snocap November 16, 2006