Lostaway noun2 •(slang) One of the fictional characters stranded on the mysterious island on the television show Lost.At the end of the previous episode, the Lostaways discovered a crate full of food and supplies that seems to have literally appeared out of thin air, […] — 2006 •(slang) A fan of the television series Lost.Die-hard "Lostaways" and other collectors will get the chance to purchase props and costumes from the series during a weekend auction at the Santa Monica Airport's Barker Hangar. — 2010 formsLostaways