Okay kiddo, so Auscannzukus is actually pretty long and hard to say all at once, so let's break it down into parts.
First, "Aus" stands for Australia, which is a big country far away from here.
Next, "cann" is short for cannabis, which is a type of plant that some people use for medicine or to feel good.
The "zukus" part is a little tricky. It actually stands for three other countries: Canada, the UK, and the US. They all have something in common with Australia: people there are starting to use cannabis more for medical purposes.
So when you put it all together, Auscannzukus is like a name for a group of countries that are working together to figure out how to use cannabis in a safe and helpful way. They're like a team of friends who are studying something new together. Does that make sense?