Add the butter to the body of a stand mixer with the paddle attachment. Whip until smooth.
1 1/2 cups salted butter
Slowly add the powdered sugar a spoonful at a time, making sure it is mixed in before adding the next, until fully incorporated. Yes, this takes a long time, but this is what makes the frosting extra fluffy.
6 cups powdered sugar
Add the coconut milk, coconut extract, and vanilla extract. Stir to combine.