=> It implies that a person is so good at (1) exploiting others or (2) making something out of nothing, that he can even squeeze something out of a stone.
(1) 極盡剝削者, 壓榨者, 連石頭都可以榨出汁來的人,
Timmy is such a stone squeezer. If you work for him, you would never see your family or the daylight again. It sounds kind of extreme, but he will make you work until 11pm every day without overtime pay.
Though the only ingredients that Janet has is flour, she is still able to cook up delicious food to feed her three little toddlers. She is the kind of stone squeezer that families with limited income require.
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