Okay kiddo, Scottish republicanism is a fancy way of saying that some people in Scotland think that they should be their own country and not ruled by kings, queens or royalty anymore.
You know how mommy and daddy make the rules in our house? Well, in Scotland, there's a lady called the Queen of England who also makes some rules for them. But some people in Scotland think that they should have their own leader who can make decisions just for Scotland.
They think the Queen should not have any power over Scotland anymore and that Scotland should become its own independent country. They believe that Scotland is a strong and proud nation and can do better with its own government, instead of being ruled by someone who lives in another country.
Some people like the idea of a republic where everyone gets a say in who their leader or president is, instead of it being passed down in a family.
But not everyone in Scotland agrees with this idea, and there are still many who believe that Scotland should stay as part of the United Kingdom under the Queen's rule. So, it's a big topic with people having different opinions.