Bouncin' on twenty fo's
While they sayin' on the radio

from R. Kelly – Ignition (Remix) Lyrics on Rap Genius

Meaning

The first line has a potential dual meaning:
1) Riding around in a car equipped with 24" rims and possibly hydraulics
2) Continuing with the running woman-car metaphor, refers to the woman’s 36-24-36 measurements, implying that her 36" chest is bouncing on her 24" waist.

In this way these lines also serve as a transition from talking explicitly about a woman (running her hands through his fro), to describing her more vaguely as a vehicle, then directing attention towards the speakers in the vehicle (“while they sayin' on the radio”), which then finally provides imagery of the incoming hook being blasted from a car’s speakers.

It’s possible that R. Kelly did not have this dual meaning in mind and was just looking for a convenient phrase that flowed and fit the rhyming scheme. Regardless, painting this picture right when the hook hits of riding around carefree with music pumping out of your speakers is key to what made this such a successful party song.

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