How's my/the boy?
slang How are you? A greeting directed at a male. Hey, great to see you again! How's my boy? Hi Murray, how's the boy?
How's my boy?
and How's the boy?Inf. How are you? (Male to male and familiar. The speaker may outrank the person addressed.) Bob: How's my boy? Bill: Hi, Tom. How are you? Fred: Hello, old buddy. How's the boy? Bob: Hi, there! What's cooking? Fred: Nothing much.