Be sleeping on the job phrase
If someone is sleeping on the job, they are not focusing on their job or are deliberately avoiding doing what they should do.
You must be sleeping on the job! You should have submitted this report last week.
That officer saw the thief, but he didn't do anything to stop that criminal. It was obvious that he was sleeping on the job!
The origin of this expression is not clear.
1.Someone viewed with contempt
2. Very bad
1. He dropped out of college and became a crumb bum.
2. The food here is crumb bum! I will never come back to this restaurant once again.