자신이 모든 것을 다 안다는 듯이 행동하거나 남보다 똑똑한 척하며 잘난 체하는 사람.
A person who is irritating because they behave as if they know everything or are more clever than others.
예문:
"Stop being a smartass and just follow the instructions."
"He always has a smartass comment for every suggestion I make."
"The teacher didn't appreciate the smartass answer from the student."