Frameup is when someone is accused of doing something they didn't do. It happens when a person is set up by someone else and made to look like they did something bad even though they didn't. It's like a trick and it's not fair. For example, a person might be framed up if someone else throws a rock through a window and then tells the police the first person did it. That's not right and it's important for the police to look for all the evidence to figure out what really happened.