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Wiktionary
good ol' boy

n. (alternative form of good old boy English)

WordNet
good ol' boy

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 [syn: good old boy, good ole boy]

Wikipedia
Good ol' boy

Good ol' boy (also good old boy) is an American slang term, applied usually to white men, that can have both positive and negative meanings, depending on context and use.

The same phrase with purely positive connotations is used in part of England.