Gun FODDER is a term used to describe soldiers who are expendable and treated as disposable. It is derived from the phrase 'cannon FODDER, ' which was used to describe infantry soldiers in the 19th century. The term GUN FODDER can be broken down into two words: GUN and FODDER. The word GUN is a 4-letter word meaning 'AMMUNITION.' FODDER is a 6-letter word meaning 'food for livestock.' Therefore, GUN FODDER can be defined as 'AMMUNITION for expendable soldiers.'