Green’s Dictionary of Slang

(Aus./N.Z.) a Methodist; also as adj.

1940		Rutherford Rumblings (Tamworth) 17 May 1: Why did the 41st pinch our Metho. Padre? [AND].
1941		Baker Popular Dict. Aus. Sl.
1961		P. White Riders in Chariot 208: Arch and me are Methoes, except we don’t go; life is too short.
1972		A. Chipper Aussie Swearers Guide 61: The first thing any full-blooded Aussie does when handling an amen snorter is shorten his denomination to size and add an ‘O’. As in Bappo, Congo, Metho, Presbo, Protto, Salvo, etc.
2003		McGill Reed Dict. of N.Z. Sl.