smartass

• smart ass
• smart arse (UK, Ireland, Commonwealth)

From smart +‎ -ass.

• Audio (General Australian):

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smartass (plural smartasses)

1. (mildly vulgar) Synonym of know-it-all, an obnoxious clever person or a person making obnoxious efforts to seem clever by acting or behaving as if they know everything.
2. (mildly vulgar) An insolent person, especially one who makes snide remarks.

   Lots of luck, smartass.

• smart aleck

smartass (not comparable)

1. (slang) Related to or characteristic of a smartass; irritatingly clever or smug.

   I have had quite enough of your smartass remarks.

smartass (third-person singular simple present smartasses, present participle smartassing, simple past and past participle smartassed)

1. (slang) To talk like a smartass, with a lot of snide remarks.
   • 2012, Storm Large, Crazy Enough: A Memoir‎^[1]:

     I smartassed and smack-talked half of the interview, but as I relaxed a bit more and genuinely talked with them, a strange thing happened.