When you come up with a fantastic idea only to be told that it has already been done, you may accuse the person who did it first of pregiarism-- pre-plagiarism.
Alice: Ok, so I had this fantastic idea for a superhero: he's a mutant, and he drains the life force of anyone he touches, so it's a great weapon but it also sucks because--
Bob: Yeah, that's Rogue. From X-Men.
Alice: ARRRRGGH stupid Marvel pregiarized my idea
To make someone and/or their wardrobe more preppy by:
(1) Buying them wear preppy/colorful clothing (e.g. polo shirts and pink skirts)
(2) Forcing them to play golf and/or tennis
(3) Making them wear their hair in a certain way
et cetera.
Also called "colorizing" when someone has proper preppy clothing but in colors that aren't so bright that they draw attention from everyonein the room, and you buy them/make them wear that sort of colored clothing.
Susan's grandmother always tries to prepperize her whenever she visits! She doesn't see that it's a hopeless cause..