Definition of good-boy in English:

good-boy

adjective

  • 1Designating a children's story in which the main character is a boy who behaves virtuously (now historical).

  • 2Generally of, relating to, or characteristic of boys who are well-behaved and well-mannered.

Origin

Early 19th century; earliest use found in Joanna Baillie (1762–1851), playwright and poet.