Bastardization of "lexiphile" (itself a fake word) originated by Peter Frederick to fuck with his readers. It's supposed to mean someone who loves reading, based off the greek lexikos ("of or for words") and philia ("fondness").

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.