What does it mean when someone puts their hands behind their head?

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Tags

1. #bigheadedness
2. #superiority
3. #certain
4. #gestures
5. #level
6. #facing
7. #speaking
8. #hands
9. #behind
10. #discomfort
11. #friends
12. #interest
13. #usually
14. #presence
15. #close
16. #indicates
17. #these
18. #interpreted
19. #person
20. #resting
21. #directly