wise guy
noun[C]
informaluk/ˈwaɪz ˌɡaɪ/us/ˈwaɪz ˌɡaɪ/(USwise ass)someone who is alwaystryingtoseemmorecleverthan anyoneelsein a way that isannoying:
自作聪明的人;自命不凡的人Okay,wiseguy, if you're sodamnedsmart, you cantelleveryone 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!