a wise guy

wise guy

1. One who is sarcastic or makes jokes in an attempt to seem witty, usually to others' annoyance; a smart aleck. Joe is such a wise guy that it's hard to know when he's being serious. Every class seems to have one disruptive wise guy.
2. A mobster. I wouldn't bother those shady characters sitting in the corner booth—they're all wise guys.
See also: guy, wise
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

a ˈwise guy

(informal, disapproving, especially American English) a man who speaks or behaves as if he knows much more than other people: OK, wise guy, what do you think we should do then?
See also: guy, wise
Farlex Partner Idioms Dictionary © Farlex 2017
See also:
References in classic literature ?
Take it from me, you're a wise guy, bless the women.