zài / zhèng / shì / chǎng / hé / shuō / shǐ / nèn / mǔ / zhè / yàng / de / zāng / huà / hěn / bù / lǐ / mào在正式场合说“使恁母”这样的脏话很不礼貌。It is very rude to use profanity such as “fuck you” in a formal setting.