My Grandma was Welsh so my Mum used to say the Taffy rhyme sometimes. I always thought that Taffy came from Daffyd so I never thought of it as a particularly derogatory term, but on tv I've heard it said with a sneer - the same as any label for people, I suppose.

My Grandma used to say "ach y fi" e.g. when she spilled something or had a minor mishap. I understand that it is just a mild exclamation that doesn't really mean anything, like "dear me" but whenever I think of it I hear my Grandma's voice and intonation, expressing frustration or something.

I never associated the term "to welsh on a deal" as being related to being Welsh, either.

Helen