Green’s Dictionary of Slang

jacksie n.¹

1. the anus or buttocks.

c.1940		‘These Foolish Things’ in Bold (1979) 212: A wanky hanky in a London taxi / Rude noises coming from a horse’s jacksey.
1943		R. Llewellyn None But the Lonely Heart 88: Calling out as if they was being kicked up the jacksie.
1945		‘The Four Wives’ in Mess Songs & Rhymes of the RAAF 26: She had those dark and dreamy eyes, / With a whiz-bang up her Jacksie.
1959		A. Sillitoe ‘Loneliness of the Long-Distance Runner’ in Loneliness of the Long-Distance Runner (1960) 28: A ’tec who’d never had as much in his pockets as that drainpipe had up its jackses.
1962		B. McGhee Cut and Run (1963) 57: Ye can stick your drink in your jacksy for a’ Ah care.
1973		(con. 1940s–60s) Hogbotel & ffuckes ‘Cats on the Rooftops’ in Snatches and Lays 25: Then jam it up the jacksie / Of your favorite choirboy.
1993		(con. 1945) S. McAughtry Touch and Go 35: I read as I walked and talked and ate and it used to get right up his jacksie.
1994		J. O’Connor Secret World of the Irish Male (1995) 45: ‘Sand up the ole Khyber Pass,’ he said [...] ‘My jaxi is really givin’ me gyp, as it ’appens.’.
2000		M. Manning Get Your Cock Out 33: [He] was stuffing all kinds of exotic pets [...] up his unsmiling friend’s stretched jacksie.
2004		Guardian G2 15 July 24: [cartoon] Hey, Big Ears [...] Do you want me to SHOVE IT up your JACKSY on your behalf?
2007		N. McAuliffe Fanny Full of Soap 116: Fuckin’ work experience, you’ll experience my boot up your jacksie if you don’t get your finger out.
2012		D. O’Donnell Locked Ward (2013) 153: Draw one [i.e an injection of tranquiliser] up for him and jag him in the jacksie.
2018		I. Welsh Dead Man’s Trousers 59: I always jacksie-rammed her [...] Taught her how to orgasm on anal.
2019		Guardian 25 Sept. 🌐 Cummings master-strategised himself on to the wrong end of a monster constitutional VAR decision, taking one of his ‘alternative branches of history’ right up the jacksy.
2020		Twitter 6 Dec. 🌐 I don't hate the BBC, per se (I love BBC4) but, by god, their news team needs a boot up the jacksy.

2. (Aus.) a brothel.

1941		Baker Popular Dict. Aus. Sl.
1955		N. Pulliam I Travelled a Lonely Land (1957) 231/2: cake shop (jacksie, poison shop) – a brothel.

In phrases

jacksie-rifling (n.)

indulging in anal intercourse.

2018

I. Welsh Dead Man’s Trousers [15]: If every cunt that had taken their first ecky committed adultery by jacksie-rifling the first psycho fucker who smiled at them [etc].

In exclamations

stick it up your jacksie! (also stick it up your jacksy! stick it up your jaxie! stuff it up your jacksie!)

a general excl. of dismissal or derision.

1951		(con. 1941) E. Lambert Twenty Thousand Thieves 150: Stick it up your jacksy. A good thing never hurt you.
1959		K. Waterhouse Billy Liar (1962) 77: For God’s sake, Billy, why don’t you tell the boring little man to stick the job up his jacksy?
1976		R. Barnes Coronation Cups and Jam Jars 109: The Good Old Days? They can stick that up their Jaxie as far as they can get.
1985		J. Sullivan ‘It’s Only Rock and Roll’ Only Fools and Horses [TV script] (Picking up drumstick) I’m gonna stick this right up your jacksy!
2003		E. Wright Hemingway Caper 30: If you had asked me, I’d have told you to stuff it up your jacksie.