Cut through the mango length-wise, about 1 inch from either side of the stem.
Slice a grid through each of the cut portions, not cutting all the way through the skin.
Place your thumbs on the skin side and flex inward, exposing the grid you just cut.
Slice out the exposed mango chunks with a knife or spoon.
Refrigerate in an airtight container, toss into a blender for a smoothie, or just eat!
Notes
I used a Tommy Atkins variety of mango since that is what my grocery store sold, yet you can use whatever variety you want (just know they come in all shapes and sizes!).
Make sure your mango is at peak ripeness when you cut it. To determine this, gently squeeze the mango. It should feel slightly soft.