If you ever mix me up or confuse me with a Canibus or Dre with a Dupri
We'll rub it in, every club you're in
We'll have you blackballed and make sure you never rap-a-fucking-gain

from Eminem (Ft. Dr. Dre) – Say What You Say Lyrics on Rap Genius

Meaning

You mix him up with Cannibus (a rapper Eminem has beefed with before) or Dre with JD, you’ll be out of the game for good..

Pretty harsh for a honest mistake, isn’t it?

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