G'd up from the feet up
Blue'd up from the shoe up's how I grew up

from Dr. Dre (Ft. Defari, Hittman, King Tee, Knoc-turn'al, Kokane, MC Ren, Time Bomb & Xzibit) – Some L.A Niggas Lyrics on Rap Genius

Meaning

Being a gangster and crip member since birth, he was always wearing blue to stay true like this guy right here:

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