This expression is used to describe an unwelcome person who it is hard to get rid of because they always come up with excuses and justifications for lingering. Under Sudanese culture it is considered shameful to turn away a guest, particularly at meal times.
This saying has an amusing story behind it.
One day Juha was approached by a man who wanted to buy his beautiful house. Juha agreed to the man’s offer but on one condition. He insisted on retaining the ownership of a single nail that had been struck into one of the walls. Being delighted with the price, the buyer agreed to this odd insistence and the sale was soon completed.
After a few days Juha arrived at the door when the family was having their dinner with the excuse that he wanted to see his nail. The new owner allowed him in and as the Arabs are famous for their generosity, Juha was invited to share their meal after seeing his nail. This was the first of innumerable visits that Juha made in the following days. Juha would arrive at all hours, day or night, on the pretext of wishing to see his nail. The new owner finally lost his temper as Juha was depriving his family of any rest and privacy. In a blind rage, he stormed out of the house, shouting to Juha, “Take your house with its nail. I don’t want it!”