And Dr. Dre said... nothing, you idiots
Dr. Dre's dead, he's locked in my basement

from Eminem – The Real Slim Shady Lyrics on Rap Genius

Meaning

This is a reference to the first single from Em’s previous album, “My Name Is”, where he introduces Dre, his producer/mentor, in this segment:

[Em] And Doctor Dre said,
[Dre] “Slim Shady, you a basehead"
[Em] Ah-ah!
[Dre] "Then why’s your face red? Man, you wasted!”

TRUST ME: When somebody is always criticizing you for getting drunk and high, you fantasize about killing them..

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