Back when I was pedaling my ten-speed bike
Who knew I'd be pedaling the six-speed white
Big dog through the yard where the little dogs bite

from Lil Wayne (Ft. Curren$y) – President Lyrics on Rap Genius

Meaning

He went from riding a bicycle to driving a white sports car (presumably with a manual transmission), and showing off that symbol of his newfound success by taking it through the section of town where his former peers were still hustling. Also, a clever homophone is tucked into this line (pedaling/peddling white) as a reference to selling coke. If you were to deconstruct it even further, you might find that “six-speed white” refers specifically to 36 ounces of cocaine, or a kilo. He’s either using the common slang practice of leaving off the first digit of a two-digit number (which in this case leaves six), or passively squaring the “six,” making 36.

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