It's D.C. double M, G

from Meek Mill (Ft. Guordan) – From Da Bottom Lyrics on Rap Genius

Meaning

Initials of the record labels that he’s is affiliated with:

First is Dream Chasers Records, which is his own label. It’s also the name of one of his mixtape series —
Dreamchasers I/II/III

Second is Maybach Music Group, which is a label founded by Rick Ross and the label Meek Mill is signed to

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