Originally Posted by West Coast Ace
That would have been my guess. But the ..I've been traveling to Asia a lot and hear 'English is hard to learn' - upon further investigation, they're trying to learn from 'English English'.
That's because Brits, unlike Americans, don't think raising their voice makes their foreign language easier to understand.
In any case tattie is not actually slang. It is one of a number of proper names for what most people call potatoes, albeit a less commonly used one.