have the time of life
have the time of (one's) life
To have a very fun, exciting, or enjoyable time (doing something). I traveled to France for the first time last summer, and I had the time of my life!
have the time of one's life
to have a very good time; to have the most exciting time in one's life. What a great party! I had the time of my life. We went to Florida last winter and had the time of our lives.