Fuckerati (pl.) is a portmanteau, pointing to the sexual version of literati, or intellectuals.
Fuckerati are the intellectuals of sex, meaning they belong to the elite caste of those experienced and knowledgeable in the most esoteric and complex ways of sex. Basically they are the know-it-alls of sex.
Singular: Fuckerat (outdated and rarely used)
Boy: That couple supposedly did all of KamaSutra and Tantic Sex in one night and still want more.
Girl: Yeah, they are famous fuckerati. Maybe we should swing with them, you'd learn a thing or two.