This amused me even though I didn't quite believe it (it was said in passing on a smug radio 4 comedy show) so this morning I checked with a couple of Welsh speakers from the village to see if this was indeed correct.
One older lady rejected the suggestion, stating her word for a microwave was indeed the word "micro-wave" only said in a sing song Welsh accent! but the other lady said the radio programme was indeed right with the proviso that the more common version of the word was the less onomatopoeic "Popty-Microdon"
It's my latest favourite Welsh word
Last Wednesday night I was working with three Welsh speaking nurses., who frequently burst into bouts of Welsh chatter when they got together. Two more Filipino nurses on shift, shared confidences in their own sing song Tagalog which left me and another member of staff "out in the cold" so to speak.
This nurse, bored with not understanding what the hell was going on suddenly, feigned a butch stance, put her hands on her hips and sang over to me, as I was preparing a set of ivs
"let's talk gay" she lisped
Well it was funny at 3.30am!