Fliff Coins serve as a digital currency within the Fliff app, allowing users to purchase premium features such as ad-free browsing and exclusive content. Users can earn Fliff Coins by engaging with the app, completing tasks, or participating in promotions. Fliff Coins also enable users to support their favorite creators by tipping them for their content. Additionally, Fliff Coins can be exchanged for real-world rewards or merchandise through partnerships with various brands. Overall, Fliff Coins enhance the user experience by providing a versatile and rewarding digital currency ecosystem.