black speeh
 

what does azg nazg gimbatul mean?

I think it would be:
"one ring to find them"

The whole thing in the black speech is
Ash nazg durbatuluk
Ash nazg gimbatul
Ash nazg thrakatuluk
Agh burzum-ish kimpatul

Which means:

One ring to rule them all
One ring to bind them
One ring to bring them all
and in the darkness bind them.