The sign of my hustle says "Don't knock, the doors broken, it won't lock
It might just fly open, get cold-cocked
You critics come to pay me a visit?
Misery loves company, please stay a minute

from Eminem – Rhyme or Reason Lyrics on Rap Genius

Meaning

Here Em references the media’s obsession with him, a topic he has spoken on before. He is warning the paparazzi that if they try snooping around his house, he might go out and “cold cock” (sucker punch) one of them to send a message.

The “don’t knock” sign is a reference to a literal sign that Em has posted on his door to keep paparazzi away. But the line is also a reference to Jay-Z’s classic track “Can’t Knock The Hustle”.

On the other hand, Em invites the critics to stay, since “misery loves company” and they’ll soon regret their choice.

A play on words with the fly(zipper of your pants) open and thus getting cold-cocked(getting a cold penis)…

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