I been there, and done that
You got guns? Ayo, I got straps
A million motherfuckers on the planet Earth
Talk that hard bullshit cause that's all they worth

from Dr. Dre – Been There, Done That Lyrics on Rap Genius

Meaning

At this point, it is 1996, and he has been in the music industry since 1983.

It is also a reference to the dark period Dr. Dre was facing in his career, when he did the firm album which didn’t have a commercial success, which made people doubt drive. Dre’s abilities as a producer and also as surpassing his break he had with the chronic, haven left deathrow at this point in his career to form aftermath.

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