Green’s Dictionary of Slang

1. (N.Z.) a Maori from the east coast of North Island (cf. coaster n.¹ (2)).

2003

McGill Reed Dict. of N.Z. Sl. 49: Coastie Maori from the East Coast of the North Island, mainly Ngati Porou and Whanau Apanui between Opotiki, the Cape and Gisborne.

2. (Aus.) a resident of the central coast of Australia, betw. Sydney and Newcastle.

2018

G. Gilmore Base Nature [ebook] There were [...] plenty of Coasties who’d survived a hard life.