What does scalloping mean?

Answer 1

In reference to food, scalloped is a term used for food that has been baked in a cream or cheese sauce.

Further definition of scalloped:

• a type of mollusk that swims by rapidly clapping its fluted shell valves together.
• the aductor muscle of a specific species of such mollusks used as food.
• a shell of a mollusk, that has radial ribs and a wavy outer edge.
• a scallop shell or dish in which food, typically seafood, is baked and served.
• a thin slice of meat, typically pounded and flattened with a mallet.
• curved cuts along the edge of a fabric or food such as a pie shell.
• 
  

Answer 2

To scallop something is to cook it in a creamy white sauce, usually with cheese. Scalloped potatoes are a good example of cooking something scalloped.