This quote means that you should try to make today better than yesterday. It's like a friendly competition between the two days. When you do awesome things today, it's like showing off to yesterday. It's saying that you should focus on making each day amazing and not dwell on the past.
In another way, this quote is like a reminder to live in the present. Instead of thinking about what you did or didn't do yesterday, you should concentrate on making today as great as possible. It's about being positive and looking forward to new opportunities.
So, don't let yesterday's mistakes or successes hold you back. Make today awesome, so yesterday feels a little envious of all the fun and excitement you're having now.