What is meaning of HMM in chatting?

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Tags

1. #sound
2. #pause
3. #someone
4. #sentence
5. #thinking
6. #something
7. #express
8. #question
9. #hesitation
10. #second
11. #exactly
12. #answering
13. #about
14. #tough
15. #defined
16. #before
17. #interjection
18. #example