good boy /ˈɡʊd ˌbɔɪ/exclamation 3noun 2forms 1 exclamation3 •Well done, to a male. •Said as praise to an obedient male dog or other male domesticated animal; see also who's a good boy.Fetch! Fetch! — (dog fetches stick) — Good boy! •(humorous) Used to demean someone. noun2 •An obedient male dog, child, or someone who behaves like one, even when deemed inappropriate.Oh you're such a good boy, not reporting the crime because you didn't want to hurt anyone. •(humorous) A demeaning term of address to a male. formsgood boys