Oh, that's Dre with an AK to his face
Don't make me kill him too and spray his brains all over the place!
I told you Dre, you shoulda kept that thang put away
I guess that'll teach you not to let me play with it, eh?

from Eminem – Criminal Lyrics on Rap Genius

Meaning

Dre was a part of N.W.A, a gangster rap group that frequently rapped about toting AK-47’s, so Eminem says it is Dre’s own fault he has a gun to his head because he introduced this crazy white boy to the gang-banging lifestyle.

http://screencast.com/t/7cZGXfuzeR

Eminem often jokes about killing Dr. Dre in his songs because the two of them are tight, and know that any lines about killing each other aren’t intended to cause any beef.

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