USA, 1924—(jocular, nautical) a bar, i.e., a counter in a pub, restaurant, etc., across which alcoholic drinks are served—also used as the name, or nickname, of an actual drinking establishment—skiers’ corresponding phrase: ‘mahogany ridge’
USA, 1966—a (13th-birthday) party held for a dog—a blend of ‘bark’ (the sharp explosive cry of a dog), and of ‘bar mitzvah’ (the coming-of-age ceremony for a 13-year-old Jewish boy), or ‘bat mitzvah’ (the equivalent ceremony for a Jewish girl)
Australia, 1937—very scarce—‘rocking horse’: a toy horse mounted on rockers or springs for a child to sit on and rock to and fro—this phrase has come to be also used in British English and American English
with reference to the Jewish prohibition of the eating of pork—‘as scarce as pork chops in a Jewish boarding house’ (USA, 1907) means ‘extremely rare’—‘like a pork chop in a synagogue’ (USA, 1915) means ‘out of place’; also ‘unwelcome’ or ‘unpopular’
Australia, 1930—a humorous extended form of ‘flat out’, meaning ‘with the maximum speed or effort’ (apparently with wordplay on ‘flat out’, meaning ‘lying stretched out’)—has occasionally been used in the opposite sense
Australia, 1928—an outstandingly good person or thing—variant of the synonymous jocular expressions, of U.S. origin, based on various parts of animals’ real or fanciful anatomy and other attributes, such as ‘the bee’s knees’ and ‘the cat’s whiskers’
Australia, 1935—meaning: ‘to deliberately ignore someone’s presence, request, etc.’—has erroneously been said to have originated in army slang during the Second World War