A group of Rory’s classmates notice her writing during in English class, and wonder what she is doing. One speculates that it may be a slam book.
A slam book is a notebook passed around a group of children or teens where people can write their thoughts and opinions on a particular topic. Usually gossipy in nature, slam books can be used to bully people.
Of course Rory is just working on her assignment.
The Annotated Gilmore Girls 