Why is slack named slack?

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Tags

1. #whether
2. #company
3. #called
4. #glitch
5. #asked
6. #derived
7. #struggle
8. #gaming
9. #believe
10. #behind
11. #developing
12. #according
13. #founder
14. #email
15. #internet
16. #cockroach
17. #stewart
18. #slack
19. #butterfield
20. #communication