Okay kiddo, have you ever played a game called "Hot Potato" where you pass a potato around quickly before the music stops? Well, imagine a grown-up game called "Project Hot Seat," where a group of grown-ups talk about a project they are working on and someone gets put in the hot seat!
The hot seat is a special chair where the person in the chair has to answer a lot of questions and people ask them about their project. It's like being asked a lot of questions during show and tell. The person sitting in the hot seat has to explain their project to the people in the room, and they are asked a lot of questions to make sure they know what they're doing.
Other people in the room might ask questions like "Why did you choose this project?" or "What's your plan if something goes wrong?" It can be a bit scary for the person in the hot seat because they have to be ready to answer any questions, but it's also helpful because they can get feedback on their project and make it better.
So, project hot seat is just a grown-up game where people talk about their work and someone gets put in the hot seat to answer lots of questions. It can be fun and useful at the same time!