UK, 1967—something or someone that is utterly ineffectual—especially in phrases such as ‘as much use as a chocolate teapot’—variants: ‘chocolate kettle’, ‘chocolate fireplace’ and ‘chocolate fireguard’
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
Australia, 1972—a person, usually a man, who, in spite of a superficial smartness, is untrustworthy—‘rat’ refers to a deceitful or disloyal man—the image is that, despite the gold tooth, a rat’s basic nature cannot change
USA, 2009—a party given for a man who is about to become a father, attended by men only—‘dadchelor’: a blend of ‘dad’ (i.e., ‘father’) and of ‘bachelor’ in ‘bachelor party’ (a party given for a man who is about to get married, attended by men only)
Australia, 1998—a pair of short, tight-fitting men’s swimming trunks—refers to the appearance of the male genitals in figure-hugging trunks—‘budgie’: colloquial abbreviation of ‘budgerigar’, denoting a small Australian parrot
UK, 1985—to be ‘stale’, to be no longer innovative, relevant, or effective—refers to the practice introduced in Britain in the early 1970s of stamping perishable goods with the latest date by which they may be sold
UK, 1983—‘Ruby Murray’, the name of a Northern-Irish singer (1935-1996), is rhyming slang for the noun ‘curry’, denoting a dish of meat, vegetables, etc., cooked in an Indian-style sauce of hot-tasting spices and typically served with rice.
1945—a woman from Liverpool, a city and seaport in north-western England—from the noun ‘Scouser’, denoting a person from Liverpool, and the suffix ‘-ette’, used to form nouns denoting female gender