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Much like a hillbilly, but a step higher.
"Man, you are such a hillwilliam."

"No I ain't, Sir."
by Circle-Man August 20, 2005
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A person who, while residing in typical "hillbilly" territory, shows no hallmarks of hillbilly behavior.
Man 1: Hey, man. You know Ted in Accounting grew up in a cabin on the Podunk River? And he's the first in his family to graduate college. Or have more than 3 teeth at the same time.

Man 2: Wow. What a hillwilliam.
by madba August 15, 2011
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