What does rubbish mean like an interjection - Tradução em português

What does rubbish mean like an interjection?
For example:
Rubbish! I wonder if you will ever grow up? We're very lucky, but what about all those people who have to spend their whole life working hard on the land or in factories? If we all have computers and robots and things we will have lots more time for hobbies and things.

Thanks,
Claudine