What is Mr Hankey Is Knocking On The Door?
1.
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.
See 
Random Words:
1. 
to give in to one's sexual urges in a quick manner; usually referring to females
dang i was with abby for 10 mintes when she was r..