A group on Livejournal where people post ideas for (usually) erotic stories they want to read. A request is "filled" when someone actually writes the story and posts it in the meme. These groups are frequently populated by women, so expect lots of homoerotic requests.
Man! The Melancholy of Haruhi Suzumiya kink meme is nothing but Kyon x Itsuki requests! I want lesbians, dammit!