Brittle, pale yellow sticks of dried soy-milk film, sold in bundles. Soaked until pliable, they turn chewy and take up sauce, and go into cold dishes with celery, braises with pork, stir-fries and soups.
Huǒguō lǐ fàng diǎn fǔzhú, xībǎo le tāngzhī tèbié hǎochī.
Put some tofu skin sticks in the hotpot; once they've soaked up the broth they're delicious.
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The 腐 comes from 豆腐, not from "rotten", and 竹 describes the shape: the film lifted from heated soy milk is rolled up and dried into stiff sticks that look like bamboo. The same film left flat is 豆腐皮 or 腐皮.