百毒 (bai du)
It refers to a type of herbal medicine, especially those harmful drugs. This is a term that is used especially in the field of healthcare. A particular saying goes "咋样可以让人百毒不侵，永葆青春。" (zǎ yàng kěyǐ ràng rén bǎi dú bù qīn, yǒng bǎo qīngchūn.)
Translating this means to say how can one not let harmful drugs affect your and maintain a healthy youthful body.
However, interestingly, this has taken a twist on the internet with it refering to the popular search engine in China — 百度 Baidu. It has a similar sound to to 百毒. This is because they experienced a trojan hack where they used SEO technology to push up their position in search results, thereby harming and endangering computer security of many in China. Netizens has thus said: 不得不说百度是“百毒”。