"Jet pilots say that when a jet crashes on a farm the farmer usually sues the government for damages done to his farm by the crash, and the amount demanded is always more than enough to pay off the mortgage and then
buy the farm outright. Since this type of crash is nearly always fatal to the pilot, the pilot pays
for the farm with his life, and has bought the farm."
With
definition 1, the metaphor of buying the farm is often elaborated upon:
*dave makes a big mistake*
jeremy: You just bought the farm.
The minister of agriculture wishes to speak urgently with you.