The widely accepted word is for microwave in Welsh is popty microdon (or just microdon) with popty meaning oven and microdon meaning microwave.

But if that’s too dull for you, you can try a try using one of the many other creative variants of microwave including meic, meicro, meicroffwrn, ffwrn ffyrnig, ffwrn fflach, or popdy sydyn. Which ones people use largely depends on the region of Wales they come from.

One word most of you will have probably encountered is popty ping, a very colloquial and onomatopoeic way of saying microwave.

Никогда так не жалела, что у меня нет микроволновки. ПОПТИ ПИНГ!