Okay kiddo, a hot box is a little like a secret clubhouse. You and your friends go into a small, enclosed space like a car or a room and you smoke something called weed, which is a plant that makes you feel relaxed and happy.
Now, when you smoke weed in a small space like a car, the smoke gets trapped inside and starts to build up. That makes the space even more smoky and can make you feel different because you're breathing in a lot of smoke.
That's what people mean when they talk about being in a hot box - it's like being in a super smoky, enclosed space that can make you feel pretty loopy. But remember, smoking weed is only for grown-ups and is not good for little kids like you, so let's stick to playing outside and having fun in the sun!