This ( probably wrongly transliterated) is a phrase I heard first in Radio Cymru’s Ofergoelus and then again during the Cadair ceremony at the Eisteddfod. In Ofergoelus, it seems to mean something like, “really nice / top drawer,” (referring to a flat that has been swankily done up).
But none of the dictionaries I have access to seem to have the phrase, so I must have either misheard or mistransliterated. Can anyone help me solve the puzzle?