Green’s Dictionary of Slang

the jury; thus you will be christened by twelve godfathers someday before long.

1728		J. Dalton Narrative of Street-Robberies 23: They are likely to stop there, till they appear before their twelve God-fathers.
c.1780		‘On Newgate Steps Jack Chance was Found’ 🎵 He stood the patter but that’s no matter: / He gammoned the twelve and he worked on the water.
1864, 1867, 1870		Hotten Sl. Dict.
1882		Sydney Sl. Dict. (2 edn) 11: Twelve Godfathers - A jury, because they give a name to the crime a prisoner has committed.
1895		Crowe Aus. Sl. Dict. 90: Twelve God Fathers, a jury.
1901		Argus (Melbourne) 20 Sept. 6/4: Those who give evidence against him ‘mount the pieter,’ [sic] he is tried by ‘the bloke with the jasey,’ or the high bloke, condemned by the twelve apostles, or the twelve godfathers.

a (large) penis.

1763		J. Wilkes ‘Universal Prayer’ in Essay on Woman 24: Save him alike from foolish Pride, / Or impious Discontent; / If greater thickness be denied, / Or thirteen Inches lent.
1787		‘Daniel M’Clean’s Gaucing Instrument’ in Daniel M’Clean’s etc. 2: Where any young Maiden that make application, / To ease her vexation, twelve inches or more, / Of a Triangled weapon of new calculation, / Shall be at her service while ev’r it can bore.
1835		‘The Great Unmentionable’ in Fanny Hill’s Bang-up Reciter 20: The thing was twelve inches long, sirs.
1964		B. Jackson Get Your Ass in the Water (1974) 55: Caught the old lady bent over shovelin’ coal, / put twelve inches up her hole.
1965		F. Pollini Glover 13: Ten inches. That enough? [Ibid.] 56: He’s quite a man [...] Twelve inches.
1976		P. Conroy Great Santini (1977) 312: I might find time to slip her a piece of my Grade A twelve incher.
1992		A. Duff One Night Out Stealing 110: It’s only eleven inches — HAHAHA...
2004		Guardian Rev. 6 Aug. 13: He calls it ‘one feet,’ which even seems to puzzle his backing vocalist. ‘You mean one foot?’ he pleads. ‘Nah, me mean one feet,’ snaps Beanie Man.

(UK und.) a twelve-month sentence.

1843

in upsetvictorians.blogspot.com 🌐 ‘[I] was quodded for prigging and had twelve-pennorth at the mill’.