wise guy(redirected from a wiseguy)
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.
An obnoxious know-it-all, a person who makes sarcastic or annoying remarks, as in the teacher was delighted that the worst wise guy in the class was moving out of town. [Slang; second half of 1800s] Also see smart aleck.
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?
n. a foolish person; a smart aleck. (see also smart guy. Also a term of address.) Look, wise guy, mind your own business!