To start, you must find a drunk slut on her period. you then must do her in the ass, making sure to get a good amount of shit on your dick. Then slip the dick into her pussy for a bit, getting some nice blood on it. Then put your dick in her mouth and blast a major cumload inside her mouth. If done properly, when she opens her mouth you should be able to see Brown, Red, and White, the colors of Neapolitan Ice Cream.
Dude, I found this horny slut last night who asked for the Neapolitan!