Okay kiddo, betel-chewing is when people take a green leaf called betel and put some paste on it. Then they add some other things like nuts, spices or tobacco on it and wrap it up into a little package. They put this package in their mouth and chew it for a while before spitting it out.
Now, you might ask why someone would want to do that? Well, some people believe that it gives them energy and helps them stay awake. Others do it for traditional or cultural reasons. However, it's important to know that betel-chewing can be bad for your teeth and can cause some health problems like cancer. So, it's better to find other ways to stay awake or to celebrate culture!