"Glitter eyeshadow" refers to a type of makeup that you apply to your eyelids. It has tiny shiny specks called glitter in it, which adds sparkle and shimmer to your eyes. Full definition
I know «they» say you shouldn't wear glitter eyeshadow past a certain age, but I intend to do so for as long as I have eyes to shadow. (thesequinist.com)
The first item they sent me was there Glitter Eyeshadow in Alabaster. (amysfashionblog.com)