Have the time of his or her life what is the meaning of this idiom?

To have the time of your life is a very positive expression: it means to have the best or most wonderful experience. It refers to a special occasion that is so Excellent you can not possibly forget it. (You can change the pronoun-- he had the time of his life; she had the time of her life. And there is a popular hit song called "I've had the time of my life.")