noun
a person who is irritating because they behave as if they know everything
adjective
showing intelligence or shrewdness, especially in a lighthearted or cocky manner
-
He often comes across as a smart aleck in meetings, always correcting others' grammar.
-
Don't be such a smart ass and just help me out with this problem.
-
Stop being a smart ass and just do what I asked you to do.
-
His sarcastic comments make him seem like a real smart ass.