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1.
The booming bass coming from the subs in a black person's car. Typically, the noise is accompanied by a horrendous vibrating rattle due to:

1) a shitty car
2) a shitty audio setup
3) a combination of both.

May also be found in cars belonging to wiggers.
"John, I would love to hear your story about how you met Newt Gingrich, but this nigger drum in the car next to us is drowning you out."
by Markles January 17, 2012