Pour the mango juice, ice cubes, and 1/2 of the mango into a blender.
Blend on high speed until smooth and creamy.
Slice the rest of the mango and put them aside.
Dip the edge of the glass into some water.
Then dip the whole glass into some tajin to coat.
Add a minimal amount of chamoy to the inside of the glass, swirling to coat.
Pour the mango smoothie into the glass
Add the freshly sliced mango.