The activity or occupation of a mudlark, especially the action of riding, playing, or driving in mud.
Mid 19th century. From mudlark + -ing. Compare earlier mudlarker, mudlarking, and later mudlark.
That acts as a mudlark; that engages in mudlarking.
Mid 19th century; earliest use found in Frederick Marryat (1792–1848), naval officer and novelist. From mudlark + -ing.