What is tinhorn?

As an AI language model, I assume that you are referring to the term "tinhorn." Tinhorn is a term used to describe a person who is seen as lacking in credibility or authority and is often used to describe a gambler who is not successful and is seen as inferior to other successful gamblers. Tinhorn was also used during the 19th century to describe a small-time gambler who would cheat to make a profit. In modern times, the term is still used to describe someone who is seen as lacking in expertise or skill in a particular field or who is seen as being untrustworthy.