1. During the Bachelorette season finale Rachel Lindsay, told Peter Kraus, that she made the right decision in saying goodbye to him. While sitting down with Chris Harrison, Peter apologized to Rachel for saying that a life without him would be “mediocre.” Rachel responded and told him that she’s definitely not living a mediocre life. “I’m living my best life,” she said.
2. A statement made at the end of a sentence declaring the actions you are doing are causing you to live your greatess life possible.
2a. It is a popular phrase used on young women's social media especially those who consider themselves hip and trendy.
I went to yoga this morning and had avocado toast for brunch, I'm living my best life.