What does it mean to call someone a Mary Sue?

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Tags

1. #author
2. #describe
3. #words
4. #almost
5. #written
6. #idealized
7. #usually
8. #originally
9. #perfect
10. #female
11. #version
12. #flaws
13. #boring
14. #fictional
15. #fanfiction
16. #character
17. #related