Maybe that's not what you called them. I actually don't know why they're called that. A slam book - according to my elementary and junior high school experiences - was a notebook with a question at the top of each page. You pass the notebook around to your friends and they got to each page to answer the questions.
The first couple of pages are basic info, like "name" and "phone number." Following pages might be favorites or opinions like "favorite color" or "cutest boy/girl in school." The first person to sign prefaces their answers on each page with #1; second person uses #2 on each page; etc.
Does this sound familiar to you? Okay, now that we've figured that out, I'm making one of these for my daughter to take to school, since they are apparently doing jacknadazippo during these last four days of school. She's in the 3rd grade, so I'm trying to keep the questions 3rd gradey. Anybody got ideas? Cmon and help a momma out.
Image above is taken from an actual slam book. See more here.