By twenty-two, I had that brand new Ac' coupe
I guess you could say that my legend just begun,

from Jay Z – 30 Something Lyrics on Rap Genius

Meaning

When Jay-z was 22 years old he purchased a brand new Acura Legend coupe automobile, presumably with some of that money from Papi

The next line is a word play with “Legend”:

A 1991 Acura Legend Coupe, Jay-Z was 22 in 1991:

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