noun a man; fellow. Used as an ironic form of friendly personal address, generally amongst males. Such is the love for this expression amongst working-class Australians, a charity organisation was formed in the 1970s under the name the Australasian Order of Old Bastards. Part of the rules of the order is that 'On encountering other O.B.'s in a bar one must administer a hearty slap on the back, accompanied with the cheerful salutation, "Hello you Old Bastard!". Membership card must be carried at all times. Failure to produce same when challenged by fellow O.B. incurs a penalty of one round of drinks' AUSTRALIA, 1944