pack of galahs
A pack of galahs is a group of loud, idiotic shielas who think they're the best at everything and can't shut up.
The pack of galahs at the BBQ talked about their dogs for 3 hours straight.
My mum and her friends are a pack of galahs. They talk about their shopping like it's a big deal.
The pack of galahs at the café all argued over who had the best coffee.