Being lost is a state of having misplaced yourself, this is often done by very foolish people. "Lost" can also apply to a possession or thing that you have misplaced. Note, if you survive a plane crash and are subsequently stuck on an island, you are not Lost, you are fucked.
Some scientists believe that there is actually no such thing as lost; that people simply do not know where they are. However, in this article, we will assume that the state of being lost is reality.