What is "chainsawed"

Usage examples of "chainsawed".

He told her that they had chainsawed the corpses that absolutely refused to return to the land of the dead, but he did not tell her that some parts had continued to squirm -- hands with no arms attached to them clutching mindlessly, feet divorced from their legs digging at the bullet-chewed earth of the graveyard as if trying to run away -- and that these parts had been doused with diesel fuel and set afire.