Game terminology, Warcraft III
Farm hiding is a term describing the act of building low-cost buildings in out of the way places on the map in RTS games (originally Warcraft III). This tactic works in games where defeat is the result of the destruction of all your buildings, which of course means that hiding farms all over the map will keep you alive as long as you can keep it up.
While farm hiding is used largely as a last resort by people who have lost and is intended to annoy the victor, occasionally it serves a real purpose. In close games, farm hiding can keep Player X alive long enough to finish sacking Player Z's base if Player Z is destroying Player X's or busy elsewhere.