But when your boy reach a billion it's a wrap (off of RAP?) YEAH!

from Jay Z – A Billi Lyrics on Rap Genius

Meaning

Jay-Z is saying once he reaches a billion dollars in net worth, it’s over, as in, the race to the first billionaire rapper is over. Currently, the closest to a billion is P-Diddy, then a close second is Jay-Z, followed by Birdman.

Jay-Z has called out Birdman in the past for claiming to make more money than Hov, saying that if he wants to take a look into Jay’s assets, he can. It’s just gonna cost him.

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