From Longman Dictionary of Contemporary Englishmy (good) manmy (good) manBritish English old-fashioned spokenMAN used when talking to someone of a lower social class – do not use this phrase My good man, I really don’t think you should be here. → man
Examples from the Corpus
my (good) man• But my man fires his gun.• I called my men to drive them back.• I heard my men going after him with their guns - and then everything went black.• But was it necessary to kill my men in cold blood?• As for fitzAlan ... did you think killing three of my men would go unnoticed?• I decided like a good captain to remain with my men.• Hey Timmy, how are you, my man? 