Green’s Dictionary of Slang

(N.Z.) a small bottle of Steinlager beer.

1991		Google Groups: soc.culture.new-zealand 26 Apr. 🌐 Steinlager (Steinie) is probably NZ’s most exported beer and it’s/has been advertised as a very international product.
2001		Google Groups: alt.native 27 June 🌐 The Steinies are in the fridge out the back.
2006		Google Groups: alt.music.zevon 17 Apr. 🌐 I eventually accumulated several cases of deposit quart ‘steinie’ bottles.