Green’s Dictionary of Slang

something or someone exceptional, notable.

1913		Sun (Sydney) 6 Jan. 6/8: These, please him infinitely more / Than books which English kids pick out, / Like ‘Skiting Sid, the Snoshter Scout’.
1921		Newcastle Sun (NSW) 15 Oct. 4/3: I gave that sneek Cross-eyed Riley a snoshter blak eye.