FU diary
It’s a fuck you diary or journal or folder or file or binder. It’s a documented, dated log of illegal or inappropriate actions taken by a person, usually a family member, against you. It’s primary use is for documentation to give as evidence to cps or the police that shows the pattern of behavior the person has engaged in towards you or your family. It is a “fuck you” because it contradicts (with photos, emails, and other concrete evidence) their alternate version of events that they have spun into a story for cps or the police.
Take a screen shot of this conversation I had with your mother about our baby. She denies that he has a peanut butter allergy. Then she demands to babysit him alone. We definitely need this for our FU diary. She claims she will call the police on us if we don’t let her have her grand baby.