少拿牛子跟我得瑟
[shăo ná niú zi gēn wŏ dé sè]
This is more of a humorous/casual internet slang, meaning Don't Be Cocky With Me (literally, Stop Showing Off Your Manhood to Me). This sort of nickname can sometimes be used when users encounter arrogant or cocky people on platforms and intend to remind them not to show off.