When you pee so hard into a urinal that it spatters piss on your pants and your knees are wet for the rest of the day...
OH MAN...don't make me laugh when I'm peeing...I'm gonna get urine-knee...
A sudden need to defecate that becomes so urgent that you don't care who you may end up making eye contact with in the restroom as long as the receptacle has a drain hole.
I was in that long, afternoon meeting we had the other day at work and I had to duck out early because of an emergenshit...can I copy your notes?