(informal) a person who is given to making conceited, sardonic, or insolent comments
2.
(US) a member of the Mafia
Slang definitions & phrases for wiseguy
wiseguy
noun phrase
(also wise apple)A person who is ostentatiously and smugly knowing; smart aleck, smart-ass: My little brother is an irrepressible wise guy(1896+)
(also wise hombre)A shrewd and knowing person; a person who is ''wised up'': The wise guys said Frank didn't stand a chance(1896+)
A professional criminal, esp a mob member: The wiseguys like places they're known/ Hanging out at a neighborhood restaurant in the Italian section of Queens, the first thing he learned is that the wiseguys never talk about what they do(1970s+ Underworld)
Idioms and Phrases with wiseguy
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. [ ; second half of 1800s ]