Little cracker jack beat
Makin' wack math, backwards producers

from Dr. Dre (Ft. Eminem & Skylar Grey) – I Need a Doctor Lyrics on Rap Genius

Meaning

Other producers make weak small-time beats (“cracker-jack beats,” as in the cheaply made snack and subsequent toys that come in the box), their work sounds horrible (“makin' wack math” refers to the notion of makin beats as a science), and these producers are “backwards”, they’re goin about it completely wrong.

Could also be a direct shot at Jermaine Dupri (as the two have had beef in the past). “Backwards” producers may allude to Dupri’s child group Kriss Kross who used to wear their clothes backwards.

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