a hyperbole that has been used to refer to something as "great" or "the greatest of its kind", became a popular snowclone template in the 1990s. The phrase entered American popular culture in September 1990 at the outset of the Gulf War, when Saddam Hussein's Revolutionary Command Council warned the U.S.-led Coalition against military action in Kuwait with the statement: "Let everyone understand that this battle is going to become the mother of all battles."[
a hyperbole that has been used to refer to something as "great" or "the greatest of its kind", became a popular snowclone template in the 1990s. The phrase entered American popular culture in September 1990 at the outset of the Gulf War, when Saddam Hussein's Revolutionary Command Council warned the U.S.-led Coalition against military action in Kuwait with the statement: "Let everyone understand that this battle is going to become the mother of all battles."[
https://en.wikipedia.org/wiki/Snowclone#The_mother_of_all_X