What does the facepalm emoji mean?

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Tags

1. #facepalm
2. #commonly
3. #added
4. #unicode
5. #under
6. #shown
7. #pressing
8. #against
9. #ineptitude
10. #display
11. #person
12. #facepalming
13. #emoji
14. #frustration
15. #situation
16. #approved
17. #written
18. #embarrassment