"Chaogang" means that what is beyond your ability is called Chaogang question, and when people encounter questions that can't be answered, they will also use this sentence to prevaricate, which is also a common expression pack in online chat.

Etymology of "Chaogang": In the past, high school teachers always said, "This problem is Chaogang, so you don't need to master it!" Later, it was made into an expression pack by netizens, and it was often used when chatting or replying to forums.