What is the origin of the idiom "smart aleck" and when to use it?

The exact origin of the idiom "smart aleck" is unclear, but it is believed to have emerged in the United States in the mid-19th century. The idiom "smart aleck" refers to a person who often makes snarky or witty remarks, typically intended to show off their intelligence or provoke others. The term carries a negative connotation, suggesting that the person's behavior is seen as arrogant or obnoxious.