I've been there before now I'm fucking with Doc

from Game – The Documentary Lyrics on Rap Genius

Meaning

He doesn’t have to worry about carrying a gun anymore, he used to be into the gangsta scene but now he’s on a label with Doctor Dre, so he can just make money making music

He’s also referring to the days when he was shot 5 times and fell into the coma. He said this for example in Dreams

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