The following quote comes from a collocation book for ESL purposes. I can see it's trying to teach us about the usage of different expressions to describe different kinds of meals.
"Whether you want a slap-up meal, a gourmet meal or just tasty, home-cooked food, there’s something for everyone in the Old Port restaurant area.
I'm interested in the difference between "slap-up meal" and "gourmet meal". My initial thought after doing some google search is this: A "slap-up meal" is an excellent meal which tends to be heavy and substantial. A "gourmet meal" is also an excellent meal, but usually calls to mind the delicate and exquisite type. Both are tasty of course!