An acronym mean Face Book Material. When one believes that a picture taken is ether worthy of being your default picture or the cover picture of a Photo Album.
Wow Jim that picture I took of you last night passed out on Nicks crotch is hilarious; its FBM to say the least.
by Jaylikesguitar October 05, 2008
Fleet Ballistic Missile Submarine. An acronym used to describe a submarine launched ballistic nuclear missile carrying submarine or "boomer". The United States currently operates these in the form of the Ohio Class.
by SirBoomALot September 11, 2011