[plusone]

It's a slang word. Is there a correct spelling?

[gcruse]

Google give 964 uses of 'dumbies,'  1,200,000 of 'dummies.'

Using an online dictionary---

The word you've entered isn't in the dictionary. Click on a spelling suggestion below or try again using the Dictionary search box to the right.

Suggestions for dumbie:

	 1. dummy
	 2. doomy
	 3. demi-
	 4. daimio
	 5. dummied
	 6. dumbly
	 7. dormie
	 8. Daumier
	 9. Domine
	10. dummies