Very difficult English to understand for a foreigner

[Teddy]

I was in a bar the other night and overheard three very hefty women talking.
Their accent appeared to be Scottish, so I approached and asked, "Hello, ladies are you three lassies from Scotland?"
One of them angrily screeched, "it's Wales, you ****** idiot, Wales!"
So I apologized and replied "I am so sorry. Are you three whales from Scotland?"

And that's the last thing I remember.