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Whereas, my old girlfriend, an accomplished dancer, could take an English walnut, clamp it between the cheeks of her buttocks, and crack them with ease. Hence the phrase walnut cracking thighs.



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we were forced out into the garage and cracked them in a vice
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Perhaps your girlfriends technique could involve a vice of some sort, but the cracking in the garage probably involved a vise. If I am wrong, please post pics.