From Wiktionary, the free dictionary
Compound of thēu (“yours,belong”) + mêi (“good”).
thēumêi
- (Patsho) thanks (an expression of gratitude)
Nyo-oh eita holouh jünü theutho, tshokü theumei.- Thankyou so much for helping me.
Theumei omieh, apa-oh lü asheu ep naih toh.- Such a grateful, if only he can succeed.