Thank you one and all for your replies.Ken Morley from Vegas.

I still use Uffarn Den, Nefoedd wen and Ysgon Daffydd or the more odd Ysgon Daffydd y mopsticks.

My mothers saying was Uffarn Dan (Hells Fire)

Sorry Tam i disagree Dy Annwyl means Your Dear or Your Beloved

Duw annwyl means Dear God or Good GodHwyl Emyr

I remember my folks using the phrase ( Du Anul ), The Welsh spelling may not be correct but it is as I remember it phonetically.Thank you in advance for any help in letting me know the meaning of this phrase.Ken Morley from Las Vegas.
updated by @kenneth-morley: 12/04/15 03:57:45PM