USA, 1896—one-word form representing a colloquial pronunciation of the phrase ‘hell’s a poppin’’ (1875)—meaning: ‘events are unfolding in a chaotic manner’; ‘a state of confusion and disarray is taking hold’—the verb ‘pop’ means ‘to suddenly break open’
USA, 1901—wonderfully stylish, elegant or fashionable—a blend of ‘swell’ and ‘elegant’—popularised by its use in the song Well, Did You Evah!, interpreted by Bing Crosby and Frank Sinatra in the 1956 film High Society
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
UK—a general term of disapproval, meaning ‘unpleasant’, ‘dirty’, ‘nasty’, ‘ugly’, etc.—shortened form of ‘grotesque’—first recorded in (and popularised by) A Hard Day’s Night (1964), a musical comedy film starring the Beatles
UK, 1975—old-fashioned; out of date—perhaps a humorous alteration of the adjective ‘antique’, perhaps punningly after the adjective ‘wacky’—or perhaps derived from ‘Ann Twack’, rhyming slang for ‘crap’
UK, 1980—denotes someone or something that is unwelcome, unpopular, etc.—first recorded in a remark by the Scottish comedian Billy Connolly, but perhaps originated in Royal-Navy slang
USA, 1999—unfashionable or socially awkward in a way regarded as appealing or endearing—blend of ‘adorable’ and ‘dork’—the noun ‘dork’ denotes an odd, socially awkward, unstylish person
UK, 1933—a jump made with a parachute—hence also the verbal noun ‘brolly-hopping’ and the verb ‘brolly-hop’—‘brolly’ (university slang, late 19th century): a clipped and altered form of ‘umbrella’
USA, 1956—denotes a core principle, value, belief, characteristic, aspect, etc., of the U.S.A. or its citizens—more generally, the nouns ‘motherhood’ and ‘apple pie’ have been juxtaposed in enumerations of things and persons exemplifying U.S. values
On the pattern of phrases such as ‘nom de guerre’, ‘nom de théâtre’ and ‘nom de plume’, ‘nom de —’ is used, often humorously, to form phrases denoting a pseudonym, an alternative name.