Means to have to defecate or have a bowel movement or to have to take a dump. Mainly used for an emergency situation, where
the movement in
imminent, but can be used for any
announcement of your condition.
Remember that
jalepeno burrito I had earlier, with the ice
cream sundae and Heinekins for dessert? Well,
Mr Hankey is knocking on the door about now!!
I've been sick all day, and I think Mr Hankey is knocking on the door again.