| 1. | Informal: Sometimes Disparaging. an adult male, esp. a Southerner. Compare good old boy. |
| 2. | a lively elderly man. |
| 3. | Chiefly British. an alumnus, esp. of a boys' preparatory or public school. |
| 4. | Chiefly British. old chap. |

| (used in informal direct address). |
| old boy n.
|