What does OB stand for?

MLA style: "OB." Acronym Finder . 2013. AcronymFinder.com 18 May. 2013 http://www.acronymfinder.com/Out-(of-the)-Blue-(OB).html
Chicago style: Acronym Finder . S.v. "OB." Retrieved May 18 2013 from http://www.acronymfinder.com/Out-(of-the)-Blue-(OB).html
APA style: OB. (n.d.) Acronym Finder. (2013). Retrieved May 18 2013 from http://www.acronymfinder.com/Out-(of-the)-Blue-(OB).html

Out (of the) Blue

This definition appears very rarely and is found in the following Acronym Finder categories:

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Ordinary Break (railway defect) Ordnance Battalion (US Navy) Ordnance Board (US Navy) Organization Behaviour Organization Block Original Budget Orlando Bloom (actor) Oskar Blues (brewery; Colorado) Ossewa Brandwag Ossewa Brandwag (Ox-Wagon Guard)		Out of Bounds (National Park Service or golf slang) Out of Business Outboard Outbye (mining) Outcast Bandicoot (fanfiction) Outdoor Broadcasting Outer Beings (gaming) Outlet Box (electrical) Outside Broadcast Outstanding Balance