AS William H Gass was said to be the first to coin the term metafiction, I thought I’d post the paragraph in which he does. It’s from Philosophy and the Form of Fiction, an essay from his 1971 collection, Fiction and the Figures of Life, and he entertains us with a bit of attitude.
There are metatheorems in mathematics and logic, ethics has its linguistic oversoul, everywhere lingos to converse about lingos are being contrived, and the case is no different in the novel. I don’t mean merely those drearily predictable pieces about writers who are writing about what they are writing, but those, like some of the work of Borges, Barth, and Flann O’Brien, for example, in which the forms of fiction serve as the material upon which further forms can be imposed. Indeed, many of the so-called antinovels are really metafictions.