Saying you sick, quit playing you prick don't nobody care
And why the fuck am I yelling at air
I ain't even talking to no one cause ain't nobody there

from Eminem – On Fire Lyrics on Rap Genius

Meaning

Eminem is a natural battle rapper. He wants to rip apart another rapper with sharp and insulting lines. The problem is, there isn’t anyone to battle because everyone is afraid of him. So he just battles imaginary people instead

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