Best definition
First used by me on facebook June 6 2011.Yoobah can be a yell of condemnation or a cry of congratulations

when used as a comment on a discussion board, depending on the writer’s inclination.It allows the writer to express derision whilst feigning the opposite. It is also used amongst friends as a show of solidarity.When doubled as, yoobahyoobah, it is always meant in its celebratory form.See also Booyah