It's a slang word. Is there a correct spelling?
Google give 964 uses of 'dumbies,' 1,200,000 of 'dummies.'
Using an online dictionary---
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Suggestions for
dumbie:
1. dummy
2. doomy
3. demi-
4. daimio
5. dummied
6. dumbly
7. dormie
8. Daumier
9. Domine
10. dummies