The idiom is derived from the behavior of a cat. When a cat sees a wiggling object, such as a string or a piece of yarn, it will often chase after it. However, the cat will never actually be able to catch the object, because it is always just out of reach.
In the same way, someone who is chasing the cat tail is always pursuing something that is just out of reach. They may never actually achieve their goal, but they will continue to pursue it anyway.
This idiom can be used to describe a variety of situations, such as:
* Someone who is trying to achieve something that is impossible.
* Someone who is wasting their time and energy on something that will never happen.
* Someone who is constantly chasing after something new, without ever being satisfied with what they have.
If you are ever feeling like you are chasing the cat tail, it is important to take a step back and assess your goals. Are they realistic? Are you setting yourself up for disappointment? If so, it may be time to reevaluate your priorities and focus on something more achievable.