GfaC started back in the 1920's, due to the reign of gangster Al Capone, who had a habit of stabbing you in the face and shooting you in the back and giving you new concrete shoes and finding new uses for woodchippers. Because of this, getting killed by his gang became known as being "Caponed", later shortened to "'GfaC" for no known reason. GfaC's current form comes from a typo in the name.
A fatal GfaC that you will remember for the rest of your life, and also may turn you emo. GfaCs are like getting ur face sat on by an elephant or decapitating ur testicles by accident.