1 definition by sorostitute 911

fratbook

the most convenient form of communication for fratstars used to keep up with brothers and of course the sorostitues from the night before. also, a great way to keep up with other people's business and to know who's hooking up with who.

"dude, did you see her fratbook she is totally dating that GDI."

by sorostitute 911 September 2, 2008