A baked dish made mostly of cornmeal, milk, and molasses. It's not pudding like Jell-O pudding, it's more of a mush. At the time, pudding was the term used for the dessert course of a meal.
Hasty pudding is a porridge-like dish of cooked grain. It is now most often associated with the American version made of ground maize or corn, but may have started out as an English oat porridge. Hasty pudding was used as a term for an oatmeal porridge in England when Hannah Glasse wrote her 18th-century book The Art of Cookery.