Going commando is when you wear pants or shorts without any underwear. Normally, when you put on clothes, you wear underwear like underwear or briefs, but sometimes people decide to go without them. This can feel really freeing and comfortable, but you have to be careful to make sure your pants don't rub against your skin and to avoid any embarrassing wardrobe malfunctions. It's kind of like choosing whether to wear socks with your shoes or go sockless. Some people prefer to go barefoot, and some people prefer to wear socks.