The term was coined in 1957 by H.L. Mencken, who said "There are people who read too much: the bibliobibuli". From the Greek "biblio", meaning books, and the Latin "bibulous", from "bibere" (to drink).
"There are people who read too much: bibliobibuli. I know some who are constantly drunk on books, as other men are drunk on whiskey or religion. They wander through this most diverting and stimulating of worlds in a haze, seeing nothing and hearing nothing". (wiktionary.org)