someone who dresses up as a character, (i.e. police officer, doctor, french maid) goes to parties, and kisses people. They don't strip, they just kiss.
A Pony Kisser is a guy who finds a "Pony" attractive. Where a "Pony" is a girl who wears a lot of makeup, does up her hair every day, wears really fancy clothes everywhere, and obnoxiously large and sparkly jewelry in order to hide the fact that underneath all of that she is just an ugly little horse.