Definition:
"Facepalm" is a slang term that refers to the act of slapping one's forehead with one's hand, usually as an expression of frustration, disappointment, or disbelief.
Use case:
You can use "facepalm" when someone says or does something that is incredibly stupid, obvious, or ridiculous. For example, if someone asks a question that has already been answered, you can respond with a "facepalm" to show your exasperation. It can also be used as a way to express your own embarrassment or shame when you make a mistake or do something foolish.
• When the comedian's joke fell flat, the audience collectively facepalmed.
• The CEO facepalmed when he saw the company's disastrous sales report.
• The teacher facepalmed when the student asked a question that was just answered.
• After realizing his mistake, the politician couldn't help but facepalm on live television.
• I facepalmed when I realized I left my phone at home.
• My mom facepalmed when I told her I forgot to submit my homework.