The most evilest niggas, nightmares of my fondest D.R.E.A.M.
Cause death rules everything around me and the cream, is a cup of lean

from Z-Ro – Pain Lyrics on Rap Genius

Meaning

Triple entendre

Evil niggas turn his dreams to nightmares when he sleep
“I can see em coming to get me in my sleep” -Zro, Tired

Then he takes the popular C.R.E.A.M. acronym and turns it into D.R.E.A.M.
Cash Rules everything around me to Death Rules Everything Around Me- Which means his dreams are just a vision that he is going to die

Then on the last lil line he’s saying everything he works for is just the cup of lean… Codeine rules everything around me…

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