Barfing Glitter

Barfing glitter is a phenomenon that occurs when someone is such a disgustingly "perfect" little Mary-Sue that glitter begins to form in their gastronomical places (stomach, intestines, etc), and causes such buildup that needs to be extricated from the body in some way.
Aforementioned Mary-Sue-like person will then begin to gracefully vomit, pouring glitter upon everyone (s)he meets.