The word kayfabe has been added to OxfordDictionaries.com as a result of its use in pop culture. Below is an excerpt from the website:
Probably not familiar to those outside the world of pro wrestling, the term kayfabe refers to ‘the fact or convention of presenting staged performances as genuine or authentic’. The origin of the word is uncertain, although it is often said to have arisen in American travelling carnivals. The word has been interpreted by some as being an alteration of ‘be fake’ backwards, while the -ay- element is typical of the way words are formed in Pig Latin.