Is this an actual Welsh phrase or just a fun example for the course?
Not an everyday expression! A proverb. But it does illustrate the particular pattern very well.
Am i being yn dwpach nag arfer? Could someone spell out what the proverb means, or when you might use it, os gwelwch chi'n dda?! - or does it actually simply mean 'skinny folk do better'?! Diolch!