פּירוש אויף איכה 4:9

For they dripped with burst bellies, etc. The corpses [of those who died] because of hunger were swollen from the aroma of the fruits of the field. The enemies would roast meat on the grass outside the wall, and the aroma would go into those swollen from hunger, and their stomachs would split, and their feces would ooze. This is an uglier death than those slain by the sword.

With burst bellies. Being split; either by the swelling of hunger or by the stabbing of the sword is called piercing [=דְּקִירָה.

From [eating] the produce of the fields. Because of the roots and grass that they gathered and ate, their feces increased and they were loathsome.