The man makes a noise at Frank's promise; perhaps a chuckle or perhaps a guffaw. He replies to Frank, "Do you like oysters? We can meet ofr lunch if that works." Lunch would be in a few hours. Now as an aside, oysters in the Midwest are generally freshwater, larger more muscular pieces of mucous without the salty brine of their smaller saltwater cousins. These generally have to grilled or fried, or covered in herbs and spices.