虎皮 literally means 'tiger skin', but it also has a figurative use in Chinese — it can describe someone who puts on a show of bravery or uses a powerful connection to intimidate others, like 'borrowing a tiger's skin'. You'll see it in idioms like 虎皮色 (tiger-skin pattern) or 扯虎皮做大旗 (to borrow a tiger's skin as a banner — to use a powerful name for one's own gain).