Definitions of rock hard:
- adjective: As tough, hard, or inflexible as a piece of rock.
- adjective: (bodybuilding) With muscles developed and toned to a high degree, especially the muscles of the abdomen.
- adjective: (figuratively) Having a very fully erect and stiff penis
- adjective: (figuratively) With strongly held beliefs and opinions, deep conviction.
(Definitions from Wiktionary)
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