I have lived most of my adult life in USA. I thought I know almost every American slang and phrases. But today I found out I still don't know many slangs and still in the learning stage. This is what happened.
I had a severe lower back pain for the past one week. I thought it would go away. But it did not. So I made a doctor appointment and saw the doctor today. She tested me for 15 minutes. While testing me, she asked me several questions. One of the question was:
Have you had an accident with your bladder or bowl?
I replied no I did not have an accident. I did not fall down and/or hurt my bladder or bowl.
The doctor smiled and said: I did not mean that. I meant did you involuntarily pee or poop in the bed or in your pants.
I said no I did not.
Now I know what an accident with a bladder or bowl means (in USA).