When I'm back in the back of my city, back in the 'bach

from Kendrick Lamar (Ft. Dr. Dre) – Compton Lyrics on Rap Genius

Meaning

Back to Compton, in a Maybach. Back to hip hop. Back to the clubs.

Get back to working on Detox.

Interesting side note:
Similar word play from Kendrick in B Boyz.

Mack in the back of a ‘Lac with a mac in the back of a 'Lac
With a latch on the back of the trunk

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