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Phrase(s): 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.
McGrawhill's American Idioms And Phrasal Verbs