By twenty-two, I had that brand new Ac' coupe
I guess you could say that my legend just begun,
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”:
The life of his Acura Legend coupe just began when he purchased it. Referring to the previous line.
He started to earn large amounts of money, so people started talking about him. Adding to his reputation, the start of his legend.
A 1991 Acura Legend Coupe, Jay-Z was 22 in 1991:
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