Green’s Dictionary of Slang

cack n.2

also cak
[15C–16C SE cack, to void excrement, itself linked to synon. Lat. cacare and OE cac-hús, a latrine]

1. [late 19C+] excrement; also used fig.

2. [1920s; 1990s+] (also kack) nonsense, rubbish [shit n. (4a)].

3. [1970s+] (Irish) a general term of abuse, a contemptuous term for an individual [shit n. (2a)].

4. [1980s+] (Aus.) something amusing.

5. [1990s+] rubbish, dirt, filth.

6. [2000s+] (Aus.) someone who has a good sense of humour.

In compounds

cackbag (n.)

[1950s+] a general pej. term, whether of people or things.

cack-catchers (n.)

[1980s] (Aus.) trousers tied at the bottoms when doing farm work.

cackface (n.)

[1990s+] a term of insult.

cackpipe (n.)

see separate entry.

In phrases

hot cack (adj.)

[20C+] (Aus.) very good [? euph. for shit-hot adj.].

kick (the) cack out of (v.)

[1970s] to beat up severely.