When it comes to moving furniture, she turns into a tough girl.
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Internet slang from around 2013 that's since gone mainstream. Generally affectionate or self-deprecating - describes a woman who's strong, independent, unfussy, and can do 'guy stuff.' The opposite is 软妹子 ('soft girl' / dainty girly-girl).
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Literally 'woman + 汉子' (a tough/manly guy). It is the female counterpart of 汉子, not related to 汉字 ('Chinese character') - same characters but different tone on 子.