What does it mean when Greek people say Opa?

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Tags

1. #purposeful
2. #shock
3. #accidental
4. #mistake
5. #greek
6. #smashing
7. #common
8. #sometimes
9. #emotional
10. #having
11. #expression
12. #plate
13. #accompanies
14. #culture
15. #especially
16. #express
17. #surprise