Nigga can't tell me nothing about this coke
Can't tell me nothing about this crack, this weed, my hustlin' niggas

from The Notorious B.I.G. – Ten Crack Commandments Lyrics on Rap Genius

Meaning

Other people can’t tell Biggie how to sell drugs, implying that he knows everything there is to know about drug dealing

After all, he was dealing from age 12.

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