What someone says when they have to pee really bad. During World War II, thousands of badly wounded Japanese soldiers were abandoned in the jungles of the South Pacific. Their wounds prevented them from being able to unbutton and pull down their trousers by themselves. Therefore, they were left to die alone with extremely full bladders.
A proclamation that holds some urgency, thereby allowing you to quickly get out of a situation. It also lets the individual that the proclamation is stated to know that you won't be back anytime soon.
Florence: Have you seen my pictures from our vacation? We took something like 500 pictures.
Ethel: I GOTTA TAKE A SHIT!!!!!
Florence: Well then I guess maybe next time.