From Longman Dictionary of Contemporary Englishold manˌold ˈman noun [countable] 1 old-fashioned informalMARRY someone’s husband, father, or boyfriend I heard her old man beats her.2 British English old-fashionedFRIEND used when speaking to a male friend Could I have a word with you, old man?
Examples from the Corpus
old man• She was always in her room with the goddamn door shut, locking your old man out. 