Hip-hop's a over-packed club and Marshall and them will get em out

from Slaughterhouse – Funkmaster Flex Freestyle Lyrics on Rap Genius

Meaning

That’s part of a Fire Marshall’s job, clear over-packed clubs and with Slaughterhouse Eminem has come to do that to the house they call the rap.
Eminem, who’s real name is Marshall, has called himself Fire Marshall in other songs including Seduction and Welcome To Hell from the Bad Meets Evil Hell: The Sequel EP. Royce used it in Session One

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