expression · to be flippant or use glib talk to show off one's wit in a way that is annoying or inappropriate

都这种时候了，你还有心思在这儿耍嘴皮？快过来帮忙！

expression · to show off with clever talk or act in a conceited, big-headed manner without backing it up with action

既然你有真本事，就别光在这儿耍嘴皮，做出点成绩来看看。