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What does sweet potato man mean?

Male sweet potato and female potato are just a code word, a joke between friends. That's usually just a joke. It is also because potatoes and sweet potatoes are the same kind that there is such a joke. This is a dialogue from an old anti-Japanese war movie, which belongs to the code name and is also a witness to the growth of childhood friends. Although this sentence is simple and catchy, it shows the child's childlike innocence.