Why is slack called slack?

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Tags

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