Add the ripe mango chunks, coconut milk, ice cubes, and lime juice into the blender.
Secure the lid and blend on high speed until the mixture is smooth, thick, and slushy, about 30-40 seconds. The sound should be loud and the texture velvety without chunks.
Stop the blender and check the consistency—if it's too thick, add a splash more coconut milk and blend briefly. If too thin, add a few more ice cubes and blend again.
Pour the vibrant, icy slushie into chilled glasses, filling them nearly to the top. It should look glossy and inviting with a bright mango hue.
Garnish each glass with a few fresh mint leaves to add a fragrant aroma and visual appeal.
Serve immediately with a straw or spoon, enjoying the cold, refreshing bite of this tropical treat.