A specific variety of
Fanservice, the
Panty Shot is
exactly what it sounds like: a gratuitous exposure of a female character's panties.
This form of Fanservice tends to be uncomfortable (and incomprehensible) to the poor souls accustomed to underwear exposition of the
Comedic Underwear Exposure variety. Often averted by using a
Magic Skirt or
Modesty Shorts.
No examples, please. This only defines the term.