Mickey Mouser; mickey noun a person from Liverpool, a Liverpudlian UK Rhyming slang for SCOUSER
[T]he character of the Manks [from Manchester] and the Mickey Mousers is vastly different. The Manks are droll, dry, think every cunt’s soft, whereas the Mickeys are the gobby, have-the-crack-at-all-costs jokers in the pack. — J.J. Connolly, LayerCake, p. 122, 2000