The fate of Sudras
The shameless husbands of lowborn sudra women live exactly like animals, and therefore they have no good behavior, cleanliness or regulated life. After death, such persons are thrown into the hell called Puyoda, where they are put into an ocean filled with pus, stool, urine, mucus, saliva and similar things. Sudras who could not improve themselves fall into that ocean and are forced to eat those disgusting things.
It is significant that this verse is spoken especially about sudras. If one is born a sudra, he must continually return to the ocean of Puyoda to eat horrible things. Thus even a born sudra is expected to become a brahmana; that is the meaning of human life.