Green’s Dictionary of Slang

1. a blow, a punch; thus fibbery n., boxing.

1790		‘The Bowman Prigg’s Farewell’ in Wardroper (1995) 284: We will mill all the culls with our fibs / And teach them a new morris-dance, sir.
1814		Sporting Mag. XLIV 111: A fib [...] which he gave the Black under the left ribs.
1821		‘Manful Exertions’ in Fancy I XVII 415: Down to posterity, he who of Fibbery / Details to the world its science and mystery, / Will weave (without fibbing) into his history / Neate valiant Neate, that extinguish’d the Gas.
1833		‘Rum Ould Mog’ in Corinthian in Spedding & Watt (eds) Bawdy Songbooks (2011) IV 33: Vith his click in his fib, and his ranting out, / In his ‘wery prime taters’ cry.

2. a club, a blackjack.

1833

H. Smith Gale Middleton 1 148: My fib [...] is loaded at the end with blue pigeon, so that it’s as heavy as a rook!