smart-arse
noun [ C ] UK offensive uk/ˈsmɑːtˌɑːs/ us/ˈsmɑːrtˌɑːrs/ (US smart-ass)
自命不凡的人，自作聪明的人
someone who is always trying to seem more clever than other people in a way that is annoying
I don't want some smart-arse from the city telling me how to manage my farm. 我不需要一个自作聪明的城里人告诉我怎样管理农场。