600 Boys, I rock with those boys
D.Rose boy, my lil bro boy

from Chief Keef – John Madden Lyrics on Rap Genius

Meaning

600 is 0600 block which is a brother group to Chief Keef’s 300 group. He would go with them, D Rose (a brother from another) is a member of 600 seen on the right in the video with a white skull cap and blue tshirt on

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