Nigga, I'm dope like the tits on Oz, get your nod off

from Sean Price (Ft. Rock (Heltah Skeltah)) – Church Lyrics on Rap Genius

Meaning

Oz was a tv series on HBO which had a prison setting. In the show the prisoners refer to heroin as tits and heroin is also called dope.
http://www.youtube.com/watch?v=ZX_6_R1NsoQ

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