Skate punk is a type of music that started in the 1980s when people who were really into skateboarding and punk rock music started making their own type of music. It's usually pretty fast and loud, with lots of electric guitar and drums, and the lyrics are often about things that skaters and punk fans care about, like rebelling against authority or just having fun with your friends.
Now, imagine you and your friends have a cool club where you all skateboard and listen to music. You only like listening to fast music with loud guitars, and you always feel like you want to go against what grown-ups tell you to do. One day, you and your friends start making your own music that sounds like the fast and loud music you love, and you sing about all the things that matter to you, like hanging out with your buddies and feeling free. That's what skate punk is! It's music made by people who love skateboarding and punk rock and who want to express themselves in their own way.