The abbreviation D.M.B. stands for Don't Make Babies, please. Usually, is said in context out of exhaustion and frustration by working class citizens who support D.M.B.'s through outrageous payroll tax contributions. D.M.B.'s or baby mamas reproduce with intent to gain financial support of any kind, and especially from the public system.
Girl A: I needs me an edumacation!
Girl D: Girl, have a baby. Yo man need to settle down anyway.
Girl A: Coo! Mo money and less him runnin round. I likes da soundsa dat! I gets my iPhone I call my boo on provided by da govt, Prada glasses provided by baby daddy (child supp), Coach purse provided by da school (grant/loan) . Nothin but the best, bitches! Haha!
Girl D: Buahahahaha!!
Thanks to the severely broken U.S. system; we have a booming generation of D.M.B.'s. Basically, idiots breeding idiots.