Princeton's WordNet

1. wise guy, smart aleck, wiseacre, wisenheimer, weisenheimer(noun)

   an upstart who makes conceited, sardonic, insolent comments

Wiktionary

1. wise guy(Noun)

   One given to making clever jokes regarded as rude or disrespectful; smart; a wisecracker.

2. wise guy(Noun)

   A knowledgable or successful sports bettor.

3. wise guy(Noun)

   A member of the Mafia; a mobster

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