Ain't slowing down, throw in the towel, towel-towel
To stop a fight, a boxer’s trainer will literally throw their towel and signal a quit. This is a challenge from Eminem to new rappers — you can either step your game up or throw the towel down now. He does not care either way…
This line, as well as perhaps the next, may refer to critics who assert that Eminem should slow his flow and has dropped off significantly since his earlier albums.
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