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1. The act of putting small coins, such as pennys and dimes, in the cup holders on car doors so that when the bass is turned up [all the way] on the car stero, [the change] rattles or is "Bumpin'. 2. A way of judging the "legitness" of a rap song's bass, if [the change] rattles than it is considered a legit song and should be enjoyed at a very high level.
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