Connectin' 4 marine batteries on one side of the trunk
To go with them other 4 batteries
Thats powering the pumps
Its the juice in them cylinders that make that Chevy jump

from Curren$y (Ft. Fiend) – Blood, Sweat and Gears Lyrics on Rap Genius

Meaning

He is talking about 4 batteries that are adjacent to another 4 batteries mounted in the truck for the hydraulic pumps that push liquid into the cylinders to make the Chevy bounce.

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