So sick I'm looking pale, wait that's my pigment
Pale is the color people turn when they are actually sick. Eminem is not actually sick, he is lyrically sick. His skin white to begin with, which implies that his lyrics are always sick.
In his music video, Eminem points to a Housegang t-shirt on Royce as he says this line, so it can also be heard as “pig men”, as a reference to Slaughterhouse.
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