Sentence:  “Damn it, Sandy,” he fumed. “You knew when we got married that I was going to hunt and fish any time I wanted to. I told you that. I said I'd marry you and take care of you, but I told you nothing was going to get in the way of my hunting and fishing. Not you. Not some five-day-a-week job. And not that little <WSD>shit factory</WSD> on your lap.” 
Meaning of the word marked with <WSD> tags:  An infant, especially one who defecates a lot.