Goosebumps yea, I'mma make your hair sit up

from Eminem – Rabbit Run Lyrics on Rap Genius

Meaning

His lines are so strong they give you goosebumps because they’re so good

When people get scared, they get goosebumps and Eminem strikes fear into all of his rap battle opponents. Given the next few lines about people hating him, this seems like an apt metaphor

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