Green’s Dictionary of Slang

1. excrement; also used fig.

1937–84		Partridge DSUE (1984) 172/1: late C.19–20.
1968		A. Burgess Enderby Outside in Complete Enderby (2002) 345: My underpants filling with bloody cack and the agony of pissing.
1974		D. Ireland Burn 32: Treated you like crap. The uniform’s khaki. We were the cack.
1983		T. Paulin ‘Politik’ in Liberty Tree 28: The city is a locked yard / that’s caked with grey pigeon-cack.
1983		Hibberd & Hutchinson Barracker’s Bible 30: ‘Onkaparinga is sticking to the rails like cack to a blanket.’ Self-explanatory.
1997		N. Barlay Curvy Lovebox 24: The gaff stinks o’ parrot cak.
2000		N. Barlay Crumple Zone 165: Ridge’s baggy pants really do look like they’re filling up with ten kgs of cak.
2000		Indep. Rev. 11 Jan. 5: On the other hand, for 750 million quid it’s a pile of cack.
2000		N. Griffiths Grits 236: A hadter go into the cubicle ferst, like, ter clean, yer know, wipe all the cack away like.

2. (also kack) nonsense, rubbish [shit n. (4a)].

1923		P. MacGill Moleskin Joe 160: ‘Con-dew-it,’ mumbled Carroty. ‘Hold your cack!’ Molesking shouted.
1997		N. Barlay Curvy Lovebox 80: Groanin’ in advance of the cak I’m gonna hear.
1999		K. Sampson Powder 122: The shite we throw away is more tuneful than all that sampled cack Helmet’s fucking with.
1999		Guardian Guide 4–10 Sept. 8: It sounds like cack for the Essex boys with big cars, kebabs and chips.
2000		Observer Rev. 30 Jan. 9: Pants, shite, total cack.
2000		P. Howard Miseducation of Ross O’Carroll-Kelly (2004) 164: The match is probably kack to watch from a spectator’s point of view.
2012		(con. 1980s) I. Welsh Skagboys 144: Forget hearin aw that cack aboot fitba n music n whae’s claimed whae n whae’s battered whae.

3. (Irish) a general term of abuse, a contemptuous term for an individual [shit n. (2a)].

1979		M. O’Beirne Mister, A Dublin Childhood 12: Coming here to raise a row, you oul cack you. Blasted oul cow!
1997		N. Barlay Curvy Lovebox 79: Shoulda fuckin’ told me y’sly piece o’ cak.

4. (Aus.) something amusing.

1987		Canberra Times 19 Sept. 6/5: ‘And remember the time that we made those fling shots,’ it was interrupted with a chorus of laughter as we anticipated what would come [...] ‘and that dag... yeh, ha, Mack, was hit in the back of his head!’ ‘That was a cack and a half’ .
1992		Woroni (Canberra) 1 Feb. 10/2: I don’t manage to brake the college distance record, but I brake the hight [sic] record. I vomit 1.42 metres up my door ... whoops, someone else’s... what a cack!!!
2001		Chaser (Sydney) 5 Apr. 16/1: The lynchings were an absolute cack. Invariably, the victim would bounce up and down on the end of the rope, mouthing off at his persecutors in a silly, pantomime-type gargling voice, before finally - the crowning glory of any comedic performance - shitting his pants.

5. rubbish, dirt, filth.

1998		M. Newall ‘Sir Gawayne and the Grene Knight’ in Indep. Weekend Rev. 26 Dec. 1: Emptied ashetrays, clered out cack and cannes.
1999		T. Hill Underground 7: Look at this cack. It’s all over everything.

6. (Aus.) someone who has a good sense of humour.

2002		Harry’s Black Hole ‘Australian Sl.’ 🌐 cack [...] someone with a sense of humour.
2015		Ccaz’s Aussie Lingo 25 Apr. 🌐 CACK = have a laugh, someone with a sense of humour.