wiseguy

The definition of a wiseguy is a smart-aleck who is annoying and full-of-himself, or a member of the Mafia or other organized crime syndicate.

(noun)

  1. An example of a wiseguy is an arrogant person at work who is always making sarcastic comments that he thinks are hysterical.
  2. An example of a wiseguy is a man in the Mafia who has been made one of the crime bosses.

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See wiseguy in Webster's New World College Dictionary

noun

  1. a person who is brashly and annoyingly conceited, knowing, etc.; smart aleck
    also written wise guy
  2. a hoodlum or gangster; esp., a member of the Mafia
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