Green’s Dictionary of Slang

1. anything or anyone excellent or first-rate.

1851		‘Epistle from Joe Muggins’s Dog’ in Era (London) 6 Apr. 4/3: I shall postepone my akkounte of ther Epsom doins till nexte weeke, wen you shall hav a fizzer.
1866		London Misc. 19 May 235: If the mare was such a fizzer why did you sell her? [F&H].
1873		J. Greenwood In Strange Company 9: He’s a fizzer on the whistle [...] The tin-whistle – don’t yer know?
1883		‘Three Chums’ in Boudoir I 9: Pretty Fanny at his lodgings; oh, she’s a regular little fizzer.
1888		‘Rolf Boldrewood’ Robbery Under Arms (1922) 318: That was a regular fizzer of a spree.
c.1905		J. Furphy Rigby’s Romance (1921) Ch. xiii: 🌐 You’ll meet your antithetical affinity yet – some woman [who] will fill the goblet of life with a delectable fizzer.
1923		‘Bartimeus’ ‘Chops and Chips’ in Seaways 101: ‘What’s your skipper like?’ ‘Oh, a Fizzer. His missus is a good scout too.’.
1923		Wodehouse Inimitable Jeeves 132: Fizzer as that sermon no doubt is, will it be good enough.
1951		Courier Mail (Brisbane) 21 Mar. 1/1: Queensland’s ‘fizzer’ cyclone [...] switched on the heat in Brisbane yesterday.

2. a notable lie.

1866

Letters by an Odd Boy 134: ‘Nurse, tell us a story.’ Yes, the phrase was well chosen; stories they were — fizzers!