Green’s Dictionary of Slang

stubbie n.

also stubby
(Aus./N.Z.)

1. [1950s+] a short, squat beer bottle holding 375ml (13fl oz); occas. the beer itself; latterly used of cans .

2. [1970s+] usu. in pl., shorts [underpinned by brandname Stubbies].

In phrases

one stubbie short of a six-pack (n.)

[2000s] (N.Z.) used of one who is eccentric, ‘not all there’.