A term used by the rap culture to represent the "bass, bumppin', thumpin', rumblin', knockin' hot beats," that are in a car from music being played loudly. All of which refers to a Gorilla pouding the inside of a car trunk creating the extremely loud "bumpin'" sound from a car as they are driving though the streets, where you may hear the car before it is seen.
by b791 May 29, 2007