Green’s Dictionary of Slang

1. (US) a very hot day.

1853

T. Haliburton Sam Slick’s Wise Saws II 196: This day is goin’ to be a sneezer.

2. something or someone exceptionally good, strong, violent etc.

1834		‘Jack Downing’ Andrew Jackson 38: He was a rale sneezer.
1834		W.A. Caruthers Kentuckian in N.Y. I 189: That’s what I call a real tear-down sneezer.
1843		T. Haliburton Sam Slick in England I 162: A great enormous sneezer of a lion.
1844		‘Jonathan Slick’ High Life in N.Y. I 143: He gave a sneezer of a pull tu it.
1855		T. Haliburton Nature and Human Nature I 98: I owned the fastest trotting horse in the United States; he was a sneezer, I tell you.
1882		Century mag. (N.Y.) Dec. 602: Caught out in a north-west sneezer.
1889		H. Smart Long Odds I 239: ‘[T]hey tell me that horse of mine is a regular “sneezer.” At all events, he keeps winning’.
1899		C. Rook Hooligan Nights 127: I see I’d got a reg’lar sneezer to ’andle.
1902		R. Dowling Tempest Driven xxiv n.p.: ‘It will be a sneezer,’ said the boatman [F&H].
1909		D. Stewart Dead Man’s Gold in Illus. Police News 13 Feb. 12/3: ‘You’ve wanted to be on deck during a dowright sneezer, and now you’ve got your wish’.
1944		A. Marshall These Are My People (1957) 63: ‘Isn’t she a sneezer! She’s the best bloody dancer in the hall,’ exclaimed Bruiser ecstatically.