And ride this around the entire song, find a line to drive it on
Park it near a metaphor, wait for it, the timer's on
You can turn your hydrants on, I'll just turn my wipers on

from Lupe Fiasco – Turnt Up Lyrics on Rap Genius

Meaning

One I get these tires on, I buy a bomb and tie it on… — Lu is making a complex metaphor where he buys a bomb and ties it onto a car, then he rides around the entire song looking for a line (bar) to drop the bomb on. He parks it near a metaphor instead of a fire hydrant. interesting series of some figures of speech eh?

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