Stir the chia seeds and coconut milk together in a small bowl. Allow to sit for 30 minutes so that the chia seeds plump slightly.
Put the mango, 2 tablespoons cold water, honey if using, lime juice and ice cubes into a blender. Blend on high until very smooth. Add the chia seed and coconut milk mixture and pulse until just combined; avoid blending the chia seeds too much. Add 1 to 2 tablespoons of cold water if needed to adjust consistency.
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