Tinkle twinkle little star, no one here knows who you are
Me I’m so big, notorious you dig

from 50 Cent – I'm On It Lyrics on Rap Genius

Meaning

Fifty is referring to all the smaller rappers out there who aren’t as famous as him, with a reference to the nursery rhyme , then he compares himself to being as famous the great one The Notorious B.I.G

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