Hennessy Dick means: Hillbillies’ male Hillbillies consume the Liquor Hennessy, believing they can remain awake for long periods but actually are only awake for very short times. Hillbillies engage or threaten to engage in acts such as “slipping and sliding”, “griping and riding” or “griping and stumbling” with other Hillbillies or males. (in Community Dictionary, added by Desiree Thornton)