I know a million people already did this
Let's make it a billion

from Jay Z – A Billi Lyrics on Rap Genius

Meaning

Hov says that a million people have already done this, as many people have already rapped over this beat, but as soon as hov does it — “a billion” will, so many more people will copy. Also links in with the title change from lil waynes “a milli” to “a billi”.

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