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

The idiom "smart ass" has its origins in American English during the mid-20th century. It is derived from the term "smart aleck," which emerged in the 19th century as a way to describe someone who is overly clever or sarcastic. The term "smart ass" is used to refer to someone who consistently displays intelligence or knowledge in a way that is perceived as annoying, disrespectful, or obnoxious. It is typically used in informal contexts to describe individuals who make condescending or snarky remarks, often with the intention of showing off their intelligence or belittling others.