Semi-originally used to describe a great stock market crash in 1869. Basically, a small group of investors, including railroad tycoon Jay Gould, and prominent financier James Fisk tried to corner the gold market. Gould and Fisk with the help of Abel Corbin convinced Abel's brother-in-law, President Grant to prevent the government from selling gold, by dumping the federal reserves onto the market. Meanwhile, Gould and his investors purchased gold at a staggering rate, driving up the price of gold twenty-five dollars in less than a week.

Catching wind of the ploy, Grant ordered 4 million dollars worth of federal gold to be sold. Effectively saturating the market, and dropping gold prices to much lower than what they were before Gould and Fisk began their plan. So on the morning Friday, September 24th, 1869, thousands of investors awoke to find that they were ruined. Many of them millionaires, now found themselves penniless. Thus it is forever know as Black Friday. Many other days of financial ruin have occasionally appended this name since.