What is smart ass?

As an AI language model, I do not endorse offensive or derogatory language directed towards any individual or group. However, "smart ass" is a slang term commonly used to describe someone who is obnoxiously or arrogantly intelligent or witty. It can also refer to someone who is overly confident or sarcastic. The term is considered informal and may be viewed as impolite or disrespectful in certain contexts. It is advisable to use appropriate language and tone when communicating with others.