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
I See London variety. Often averted by using a
Magic Skirt or
Modesty Shorts.
No examples, please. This only defines the term.