What does OK Boomer mean?

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Tags

1. #which
2. #birthrate
3. #during
4. #usually
5. #following
6. #world
7. #boomer
8. #considered
9. #aging
10. #marked
11. #person
12. #older
13. #years
14. #whose
15. #population
16. #there
17. #especially
18. #period
19. #viewer