A book or magazine kept on the tank of the toilet for duece-dropping reading material. Seen as unfit to be shared.
I saw this year's swimsuit issue at Dave's but then realized it was his brown book so I didn't touch it.
by Camaro829 February 25, 2009
a small notebook or document in which an individual keeps a running list of the names and phone numbers of people they have had anal sex with.
bro 1: "hey man, do you have that Puertorrican midget's number?
bro 2: "yeah it's in my little brown book, let me get it"
(bro 2 pulls out LBB)
bro 1: damn, that thing looks like a phone book, no wonder every girl in this city is walking funny."
bro 2: "yeah it's in my little brown book, let me get it"
(bro 2 pulls out LBB)
bro 1: damn, that thing looks like a phone book, no wonder every girl in this city is walking funny."
by mitchy P February 13, 2014