I say a B.I.G. verse, I'm only Bigging up my brother
Bigging up my borough --I'm big enough to do it
I'm that thorough, plus I know my own flow is foolish
Jay’s response to people who say he steals too many lines from Biggie — in fact, he’s doing it to pay tribute to his fallen friend and to the borough they both lived in. Since Jay Z is a rapper roughly as good as Biggie, he has the right to use Biggie’s lines to pay homage to him whereas some small-time rapper who did so would just be overstepping his bounds.
He’d later explain more about this on an interview in 2011:
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