Shlemiel is a Yiddish word that refers to a clumsy, incompetent, or foolish person. It's often used humorously, but it can also be used to express annoyance or frustration.
Here are some other examples:
* "That shlemiel spilled coffee all over my new laptop."
* "He's such a shlemiel! He forgot to bring the keys to the meeting room again."
* "I can't believe I married that shlemiel!"
Remember that the word "shlemiel" can be considered offensive by some people, so use it with caution.