good old boy

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Slang A man having qualities held to be characteristic of certain Southern white males, such as a relaxed or informal manner, strong loyalty to family and friends, and often an anti-intellectual bias and intolerant point of view.

Wiktionary

1. n. idiomatic A male friend or chum, especially a schoolmate; a man with an established network of friends who assist one another in social and business situations; a decent, dependable fellow.
2. n. idiomatic, sometimes derogatory A friendly, unambitious, relatively uneducated, sometimes racially biased white man who embodies the stereotype of the folksy culture of the rural southern USA.

WordNet 3.0

1. n. a white male Southerner with an unpretentious convivial manner and conservative or intolerant attitudes and a strong sense of fellowship with and loyalty to other members of his peer group