Combine Everything in a Pitcher: Pour the pineapple juice, blue curacao, Malibu rum, and cream of coconut into a large pitcher. Whisk until the cream of coconut is fully blended and the mixture is smooth.
Pour It Into the Machine: Pour the mixture into the Ninja SLUSHi reservoir. Keep the liquid below the MAX fill line, then close the lid securely.
Run the Spiked Slush Cycle: Press the power button and select the Spiked Slush preset. Let the machine run for about 20 to 40 minutes, depending on how cold your ingredients are.
Pour and Serve: Place a glass under the dispenser. Slowly pull the handle forward and fill the glass with the Blue Hawaiian Slush. Release the handle, add your favorite garnish if desired, and serve immediately.