Most prominently used in Lauren Faust's reincarnation of My
Little Pony show,
Friendship is Magic, and its fans who call themselves bronies. It is a pony-speak for "
ladies and gentlemen", or more appropriately, "boys and girls". It is related to somepony, anypony, everypony, etc.
"Fillies and gentlecolts! As mayor of Ponyville, it is my great
pleasure to announce the beginning of the Summer Sun
Celebration!"
-Mayor of Ponyville, The Mare in
the Moon pilot episode.