Green’s Dictionary of Slang

1. (Aus./N.Z.) an admirable or outstanding individual.

1909		Sun. Times (Perth) 19 Dec. sec. 3: Good on you, my boy, you’re a snodger.
1941		Williamstown Chron. (Vic.) 15 Mar. 2/3: You snodger, you certainly come hot.
1952		Sydney Morn. Herald 10 Sept. 1: What a whizzer she is [...] A real snodger.

2. (Aus./N.Z.) an excellent example of something.

1920		Table Talk (Melbourne) 7 Oct. 34/1: [of a horse] ‘A real snodger!’ they called him / ‘A regular rumpty-tummer!’.
1923		Mirror (Perth) 29 Sept. 4/3: Coffey’s first goal was a snodger.
1938		Argus (Melbourne) 6 Jan. 3/1: She’s [i.e. a boat] a regular snodger. She can steam 12 knots when she’s oput to it.
1941		Baker N.Z. Sl.:
2001		Observer Sport Monthly Dec. 34: Some guys have landed real snodgers. Marlin. Ten footers.