The giant struck several heavy blows on the bed which Jack slept with his club but he had laid a billet in the bed in his stead before that.
With that, greatly wondering, the giant led Jack to breakfast, bringing him a bowl containing four gallons of hasty pudding. Being loth to let the giant think it too much for him, Jack put a large leather bag under his loose coat, in such a way that he could convey the pudding into it without its being perceived. Then, telling the giant he would show him a trick, taking a knife, Jack ripped open the bag, and out came all the hasty pudding. Whereupon, saying, 'Odds splutters her nails, hur can do that trick hurself', the monster took the knife, and ripping open his belly, fell down dead.
This is from English fairly tales. I can't understand the meaning " Odds splutters her nails, hur can do that trick hurself ". What is the word "hur" and why did the Giant rip open his belly? Could you teach me?