Place the watermelon chunks and ice cubes into a blender.
Secure the lid and blend on high speed until the mixture is smooth, icy, and uniform in texture. This usually takes about 30 seconds to 1 minute.
Stop the blender and check the consistency; if it’s too thick, add a splash of water or more watermelon and blend again until it reaches your preferred smoothness.
Pour the blended mixture into glasses, allowing the vibrant pink color and icy texture to spill over the rims.
Serve immediately with a straw or small spoon, enjoying the refreshing, icy sensation and juicy flavor.