Lostaphile Share definition Flag Obsessive watcher and analyzer of ABC's television show, LOST. "Did you see the Hanso foundation commercial at the end of yesterday's Lost?" "You're such a Lostaphile." Lostaphile by Kai er May 30, 2006 0 0 Get merch Get the Lostaphile mug. Buy Now — $32.95 See more merch