"N'ahp" is a good one. It's a kind of half-arsed sound that means 'Oh yes?' or vague, non-committal assent.
They call woodlice 'Daddy Granfers' round here, which is a funny one because it was only relatively recently I realised that no-one else calls them that. Because, y'know, you don't talk about daddy granfers that much in the real world.
Here's some more words if you're interested.