When you eat fatty foods (including hot chips) it gives you a stabbing like feeling in your lower back.
"I had so many hot chips last night I got a wicked case of potato back"
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Someone that has bad posture or a hunched back that curves in weird ways like a potato.
Wow, Vlad your friend Roee is so cute can I get his number? Just so you know he is a potato back. Oh, nevermind then *proceeds to go vape in the bathroom*