wise guy
noun [ C ] informal uk/ˈwaɪz ˌɡaɪ/ us/ˈwaɪz ˌɡaɪ/ (US offensive wise ass)
自作聪明的人;自命不凡的人
someone who is always trying to seem more clever than anyone else in a way that is annoying
Okay, wise guy, if you're so damned smart, you can tell everyone how it's done! 好吧,自作聪明的家伙,你要是真有那么聪明,就可以告诉大家该怎么做了!