With silicone racks with a real big ass
Make her bounce it like hydraulics

from Maejor Ali (Ft. Juicy J & Justin Bieber) – Lolly Lyrics on Rap Genius

Meaning

Hydraulics are a mechanical system typically utilized in Lowrider cars to make them bounce up and off the ground. Juicy can get her ass and tits bounce in just as spectacular fashion.

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