Bugchasing is when someone wants to catch a sickness or disease on purpose. Just like when you try to catch a ball, people who do bugchasing try to catch a sickness, like HIV, on purpose. This is very dangerous and not a good idea because these illnesses can be very harmful and even deadly.
People who do bugchasing may have some reasons, such as they want to feel a sense of community or they have a feeling of excitement from doing something dangerous. But no matter what the reason is, it's a really bad thing to do. It's important to try your best to stay healthy and to avoid getting any sicknesses or diseases.