Place the ripe mango chunks, freshly squeezed lime juice, coconut water, and ice cubes into a blender.
Blend on high speed until the mixture is smooth, thick, and frosty, about 30-45 seconds, with no large ice pieces remaining.
Pause the blender briefly to check the consistency; it should be creamy and icy but pourable.
Taste the slushie and add a splash more lime juice if you prefer a tangier flavor, then blend briefly to incorporate.
Pour the chilled mango slushie into glasses, allowing the vibrant orange color to swirl slightly with the frosty texture on top.
Serve immediately with a straw or a garnish of lime wedge for an extra touch of citrus.