Rusty Jack Knife


a rusty jack knife is a slang term for a geriatric man who porks women much younger than him. the “rusty jack knife” comes in to play as a reference to his p-n-s, which, aged, is rusty (hard to get erect), jacked (may have liver spots or warts), and knifed (smaller than the original youth size.)
“g-d d-mn! that old guy is a rusty jack knife!”

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