UK, 1839—a Liverpudlian, especially as opposed to a Mancunian—from the 19th-century distinction between the Liverpudlians, who were involved in trading, and the Mancunians, who were involved in manufacturing
UK, 1975—old-fashioned; out of date—perhaps a humorous alteration of the adjective ‘antique’, perhaps punningly after the adjective ‘wacky’—or perhaps derived from ‘Ann Twack’, rhyming slang for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’
1923—from Bernard Pykett’s plea when asking for money after his diving exhibitions—popularised from 1941 onwards by the BBC radio comedy programme It’s That Man Again
1968—Liverpool Roman Catholic cathedral—from the large number of Roman Catholics of Irish descent in Liverpool and the resemblance of the cathedral to a tepee
The original sense of ‘Scouse’, denoting a person from Liverpool, is ‘a stew’. The word ‘scouse’ is in turn a shortening of ‘lobscouse’, of obscure origin.