Buy my CD twice; they see me in the streets
They be like, "Yo he nice, but that's on the low though"

from The Notorious B.I.G. – Long Kiss Goodnight Lyrics on Rap Genius

Meaning

People admire Big’s rapping skills and clothing but are hesitant to say it out loud and want to keep their opinion secret.
Even the people beefing with him actually think he is amazing
(This is true — 2Pac was a great admirer of Biggie’s flow)
For some reason, ‘Pac has NOTORIOUS tattooed on his right forearm.

Also notable is that this is on Biggie’s album “Life After Death” meaning everyone listening, even the haters, bought his CD twice (When determining Platinum, Gold, etc status for albums, each purchase of a double-album counts as TWO purchases towards the total selling numbers)

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