Green’s Dictionary of Slang

(Aus.) a Victorian as seen from New South Wales, or a native of New South Wales or Victoria viewed from Queensland.

1980		Sydney Morning Herald 21 Apr. 3: Victorians – whom South Coasters affectionately call Mexicans – used to use the Hume [Highway] as the quickest route to holiday spots such as Surfers Paradise and the Sunshine Coast [GAW4].
1985		in Tracks (Aus.) Sept. 5: Hello all you Mexicans, how’s life in the Garden State [i.e. Victoria].
1993		Aus. Word Map 🌐 Mexican. 1. someone from Victoria (from south of the River Murray): Joe here is just visiting. He is a mexican. 2. someone from NSW or anywhere south of the border.
1993		Aus. Word Map 🌐 1. someone from Victoria (from south of the River Murray): Joe here is just visiting. He is a mexican. 2. someone from NSW or anywhere south of the border.