Lad lit is like books for boys that are all grown up. Just like when you were little and you liked books that were silly and fun, lad lit books are silly and fun too, but they're also for grownups. These books usually follow a guy character who is going through some kind of adventure, like trying to find love or figuring out what he wants to do with his life. There might be some romance and some jokes, and the main character might be a bit of a goofball, but it's all in good fun. Think of it like a funny movie, but in book form!