cast-iron stomach

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cast-iron stomach

The ability to eat foods that others may find unusual, unpalatable, or too spicy, without experiencing any ill effects like nausea or upset stomach. My husband has such a cast-iron stomach that he can eat a ghost pepper and feel perfectly fine afterward. You must have a cast-iron stomach if you're eating pickles with peanut butter!
See also: stomach

cast-iron stomach

Fig. a very strong stomach that can withstand bad food or anything nauseating. If I didn't have a cast-iron stomach, I couldn't eat this stuff. Fredknown for his cast-iron stomach—ate ten whole hot peppers.
See also: stomach