When was the word gnarly invented?

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Tags

1. #sense
2. #origin
3. #generally
4. #stone
5. #middle
6. #gnarled
7. #later
8. #before
9. #misshapen
10. #english
11. #comes
12. #knotty
13. #slang
14. #knurled
15. #original
16. #variant
17. #awful
18. #which
19. #spelling
20. #meaning
21. #unknown
22. #unpleasant
23. #gnarly
24. #century