Mix the Orange and Cream Base: In a small bowl, whisk together 1 cup orange juice and 1 full can of sweetened condensed milk. Keep whisking until the mixture is smooth with no lumps or streaks.
Add Everything to the Ninja SLUSHi: Pour the orange and cream mixture into the Ninja SLUSHi vessel through the fill port. Add half of the 2-liter bottle of orange Crush soda. For the adult version, add 1 cup of liquor as well. Keep the total liquid between the machine's 16-ounce minimum and 64-ounce maximum.
Choose Your Setting and Freeze: Turn on the machine and select Slush. Use Spiked Slush when adding liquor. Let the machine run for 15–60 minutes, depending on the starting temperature and amount of liquid. The lights will pulse while freezing and turn solid with a beep when the slush is ready.
Dispense and Finish: Place a cup under the dispenser on the drip tray and slowly pull the handle to pour. Release the handle when the cup is full. Top with whipped cream and place an orange creamsicle popsicle on top as a garnish. Serve cold and thick.