Kick the Empire's ass day was the name given to a specific day by the Kaminoans to the day on which they kicked the Empire's ass. It all started when Darth Vader arrived on Kamino because he needed more Clone troopers Stormtroopers. Unfortunately the Empire had a reputation for always paying their bills late, and the Kaminoans hated it when people payed their payed them late. So, the Kaminoans decided to kick the Empire's ass in stead of making another army for them.