good old boy

(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.

(idiomatic, chiefly Southern US, sometimes derogatory) A friendly, unambitious, relatively uneducated, sometimes racially biased or misogynistic white man who embodies the stereotype of the folksy culture of the rural southern USA.