What does 1 ER mean in the biker world?

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Tags

1. #clubs
2. #distinguished
3. #motorcyclists
4. #colors
5. #citizens
6. #percenter
7. #american
8. #refer
9. #abiding
10. #association
11. #motorcycle
12. #comment
13. #motorcyclist
14. #percent
15. #patch
16. #implying
17. #outlaws
18. #outlaw