Too many people in the world according to this comedian. Trailer parks and counsel flats are filling up with miracle babies.
Of course miracle babies is a sarcastic reference to the religious reverence for the chemical process that creates life.
Bill Hicks humor sometimes took a darker turn, but a lot of people now believe that the world is overpopulated, and without predators to thin the herd, it seems that the least intelligent are reproducing the fastest.