Green’s Dictionary of Slang

1. something exceptional.

1907

Brisbane Courier 29 May 6/3: A variant which has lately come into favour is ‘snoshter,’ and in it we find, the strongest confirmation of Lewis Carroll’s theory of ‘portmanteau words’. Some lad has hesitated a moment between the old favourite ‘snorter’ and the comparatively new term ‘boshter’.

2. (Aus.) a blow from the fist.

1907		Brisbane Courier 29 May 6/3: ‘Then Billy socked him a snoshter in the mush and loosened his tusks’.
1918		S. Bourke & Mornington Journal (Richmond, Vic.) 11 July 2/8: He socks me a snoshter on the mush.
1933		Sun (Sydney) 24 May 12/3: Purdy led to Crowl with a right-cross Karo-Kann snoshter, and a pawn went up.