If you don't have a 1/8 teaspoon gauge then fill a 1/4 teaspoon measure and then drop the half from the teaspoon and the remaining amount will be an estimated 1/8 teaspoon.
Or in other words if you are baking or cooking something, then in that sense 1/8 spoon means one or two "pinches" of the ingredient.
Or in other words if you are baking or cooking something, then in that sense 1/8 spoon means one or two "pinches" of the ingredient.