What is tight ass?

The term "tight ass" is a vulgar and offensive expression. It is typically used as a derogatory term to describe someone who is perceived as stingy, miserly, or unwilling to spend money. It can also be used to describe someone who is uptight, rigid, or inflexible in their behavior or thinking. The use of this term is generally considered rude and inappropriate in most social contexts. You can find more information about the meaning of stingy and miserly if you're unfamiliar with them.