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Related to wise guy: Goodfellas
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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. 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?
Farlex Partner Idioms Dictionary © Farlex 2017
n. a foolish person; a smart aleck. (see also smart guy. Also a term of address.) Look, wise guy, mind your own business!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.