noun
smartass
noun
1
Someone who acts in an obnoxiously clever or know-it-all way.
"Nobody likes a smartass who corrects everyone at the dinner table."
How to Use Smartass
Learner’s notesIn plain EnglishAn annoyingly clever or sarcastic person.
When to use it
Vulgar slang — avoid in formal writing or polite company.
Word Forms
smartassed past tense, smartasses plural, smartasses singular
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Etymology
A compound of "smart" and the slang suffix "-ass," used to intensify or mock the quality it attaches to.