UK, 1927—affected, pompous—from ‘pound note’ and the suffix ‘-ish’, meaning ‘having the qualities of’—the image is probably of someone who pretends to be worth a pound sterling when they are actually worth less
UK, 1955—‘cobblers’, short for ‘cobbler’s (or cobblers’) awls’, is rhyming slang for ‘balls’, i.e., ‘testicles’, and figuratively ‘nonsense’, ‘rubbish’
women regarded collectively as objects of sexual desire; sexual intercourse—first recorded in ‘The Gilt Kid’ (1936), by James Curtis (Geoffrey Basil Maiden)