wise guy
noun
Informal.
a cocksure, conceited, and often insolent person; smart aleck: He has a reputation for being a wise guy.
Also called
wiseacre.
Origin of wise guy
An Americanism dating back to 1895–1900
OTHER WORDS FROM wise guy
wise-guy, adjectiveWords nearby wise guy
British Dictionary definitions for wise guy
wise guy
noun
informal
a person who is given to making conceited, sardonic, or insolent comments
US
a member of the Mafia
Idioms and Phrases with wise guy
wise guy
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.