What does the man Facepalming emoji mean?

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Tags

1. #culture
2. #stupid
3. #gesture
4. #exactly
5. #emoji
6. #feeling
7. #symbol
8. #senseless
9. #meanings
10. #something
11. #wrong
12. #because
13. #disappointed
14. #facepalming
15. #frustrated
16. #deeply
17. #ashamed
18. #obviously