Oh d, a common popular phrase utilized by several individual communities, especially common within African-American sectors. The roots of this booty phrase are thought to come from "oh damn" or more accurately "oh deeeeam." This phrase is highly reccomended.
The Big Three were Britain, the United States, and France in WWI. Italy also tagged along but was not considered by many to be one of the Big Three. Many parralells exist between this and it's metaphoric equivalent of certain "large" social groups within a certain school community.
Oh d, look at the Big Three. They're enormous and growing by the day. Look at "Italy" tagging along.