A shlemiehl is an unlucky person who often has bad things happen to them.
The word shlemiehl is usually used in a funny or sympathetic way.
Examples:
He's such a shlemiehl, he always loses his keys.
The poor shlemiehl tripped and fell again.
The shlemiehl never wins anything.
I feel like a shlemiehl today, everything is going wrong!
He's the biggest shlemiehl in the whole town, nothing ever goes right for him.
The shlemiehl's luck is so bad, it's like a story in a book.