I got these cracker doctors saying, "yeah Bob, this nigger's sick"

from Tyler The Creator – Tron Cat Lyrics on Rap Genius

Meaning

The white doctors are going “Yeah Bob, this nigger’s sick”.

Possibly a reference to this line from B.o.B’s Odd Future diss:

You can call me sick, you can even call me nauseous

This is saying that the white doctors are say to B.o.b that Tyler is sick (which in this case can be taken as a literal meaning, and as “fucking awesome.”)

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