Add the watermelon chunks and ice cubes into a blender.
Pour in the lime juice for a bright, tangy flavor.
Blend on high speed until the mixture is completely smooth and has a thick, slushy texture, about 30-60 seconds.
Check the consistency—if it’s too thick, add a splash of water and blend briefly to loosen; if too runny, add more ice and blend again.
Pour the vibrant pink slushie into chilled glasses.
Garnish each glass with a sprig of fresh mint for a fragrant touch.
Serve immediately with a straw and enjoy this cooling summer treat.